diff --git a/features/dom.yml b/features/dom.yml
new file mode 100644
index 00000000000..5001c821c12
--- /dev/null
+++ b/features/dom.yml
@@ -0,0 +1,276 @@
+name: DOM
+description: The DOM (Document Object Model) API represents HTML and XML documents as trees of nodes. You can use the API to inspect and modify the structure and content of a document.
+spec: https://dom.spec.whatwg.org/
+status:
+  compute_from: api.Document
+compat_features:
+  - api.Attr
+  - api.Attr.localName
+  - api.Attr.name
+  - api.Attr.namespaceURI
+  - api.Attr.ownerElement
+  - api.Attr.prefix
+  - api.Attr.value
+  - api.CDATASection
+  - api.CharacterData
+  - api.CharacterData.after
+  - api.CharacterData.appendData
+  - api.CharacterData.before
+  - api.CharacterData.data
+  - api.CharacterData.deleteData
+  - api.CharacterData.insertData
+  - api.CharacterData.length
+  - api.CharacterData.nextElementSibling
+  - api.CharacterData.previousElementSibling
+  - api.CharacterData.remove
+  - api.CharacterData.replaceData
+  - api.CharacterData.replaceWith
+  - api.CharacterData.substringData
+  - api.Comment
+  - api.Comment.Comment
+  - api.DOMImplementation
+  - api.DOMImplementation.createDocument
+  - api.DOMImplementation.createDocumentType
+  - api.DOMImplementation.createHTMLDocument
+  - api.DOMStringList
+  - api.DOMStringList.contains
+  - api.DOMStringList.item
+  - api.DOMStringList.length
+  - api.DOMTokenList
+  - api.DOMTokenList.@@iterator
+  - api.DOMTokenList.add
+  - api.DOMTokenList.add.multiple_parameters
+  - api.DOMTokenList.contains
+  - api.DOMTokenList.entries
+  - api.DOMTokenList.forEach
+  - api.DOMTokenList.item
+  - api.DOMTokenList.keys
+  - api.DOMTokenList.length
+  - api.DOMTokenList.remove
+  - api.DOMTokenList.remove.multiple_parameters
+  - api.DOMTokenList.remove_duplicates
+  - api.DOMTokenList.replace
+  - api.DOMTokenList.replace.boolean_value
+  - api.DOMTokenList.supports
+  - api.DOMTokenList.toString
+  - api.DOMTokenList.toggle
+  - api.DOMTokenList.toggle.force_parameter
+  - api.DOMTokenList.trim_whitespace
+  - api.DOMTokenList.value
+  - api.DOMTokenList.values
+  - api.Document
+  - api.Document.Document
+  - api.Document.DOMContentLoaded_event
+  - api.Document.URL
+  - api.Document.activeElement
+  - api.Document.adoptNode
+  - api.Document.append
+  - api.Document.body
+  - api.Document.characterSet
+  - api.Document.childElementCount
+  - api.Document.children
+  - api.Document.close
+  - api.Document.compatMode
+  - api.Document.contentType
+  - api.Document.createAttribute
+  - api.Document.createAttributeNS
+  - api.Document.createCDATASection
+  - api.Document.createComment
+  - api.Document.createDocumentFragment
+  - api.Document.createElement
+  - api.Document.createElementNS
+  - api.Document.createNodeIterator
+  - api.Document.createProcessingInstruction
+  - api.Document.createTextNode
+  - api.Document.createTreeWalker
+  - api.Document.createTreeWalker.whatToShow_filter_parameters_optional
+  - api.Document.currentScript
+  - api.Document.defaultView
+  - api.Document.dir
+  - api.Document.doctype
+  - api.Document.documentElement
+  - api.Document.documentURI
+  - api.Document.embeds
+  - api.Document.firstElementChild
+  - api.Document.forms
+  - api.Document.getElementsByName
+  - api.Document.getElementById
+  - api.Document.getElementsByClassName
+  - api.Document.getElementsByTagName
+  - api.Document.getElementsByTagNameNS
+  - api.Document.hasFocus
+  - api.Document.head
+  - api.Document.hidden
+  - api.Document.images
+  - api.Document.implementation
+  - api.Document.importNode
+  - api.Document.lastElementChild
+  - api.Document.lastModified
+  - api.Document.links
+  - api.Document.open
+  - api.Document.plugins
+  - api.Document.prepend
+  - api.Document.querySelector
+  - api.Document.querySelectorAll
+  - api.Document.readyState
+  - api.Document.readystatechange_event
+  - api.Document.referrer
+  - api.Document.replaceChildren
+  - api.Document.scripts
+  - api.Document.title
+  - api.Document.visibilityState
+  - api.Document.visibilitychange_event
+  - api.DocumentFragment
+  - api.DocumentFragment.DocumentFragment
+  - api.DocumentFragment.append
+  - api.DocumentFragment.childElementCount
+  - api.DocumentFragment.children
+  - api.DocumentFragment.firstElementChild
+  - api.DocumentFragment.getElementById
+  - api.DocumentFragment.lastElementChild
+  - api.DocumentFragment.prepend
+  - api.DocumentFragment.querySelector
+  - api.DocumentFragment.querySelectorAll
+  - api.DocumentFragment.replaceChildren
+  - api.DocumentType
+  - api.DocumentType.after
+  - api.DocumentType.before
+  - api.DocumentType.name
+  - api.DocumentType.publicId
+  - api.DocumentType.remove
+  - api.DocumentType.replaceWith
+  - api.DocumentType.systemId
+  - api.Element
+  - api.Element.after
+  - api.Element.append
+  - api.Element.attributes
+  - api.Element.outerHTML
+  - api.Element.before
+  - api.Element.childElementCount
+  - api.Element.children
+  - api.Element.classList
+  - api.Element.className
+  - api.Element.closest
+  - api.Element.firstElementChild
+  - api.Element.getAttribute
+  - api.Element.getAttributeNS
+  - api.Element.getAttributeNames
+  - api.Element.getAttributeNode
+  - api.Element.getAttributeNodeNS
+  - api.Element.getElementsByClassName
+  - api.Element.getElementsByTagName
+  - api.Element.getElementsByTagName.all_elements_selector
+  - api.Element.getElementsByTagNameNS
+  - api.Element.getElementsByTagNameNS.all_elements_selector
+  - api.Element.hasAttribute
+  - api.Element.hasAttributeNS
+  - api.Element.hasAttributes
+  - api.Element.id
+  - api.Element.innerHTML
+  - api.Element.insertAdjacentElement
+  - api.Element.insertAdjacentHTML
+  - api.Element.insertAdjacentText
+  - api.Element.lastElementChild
+  - api.Element.localName
+  - api.Element.matches
+  - api.Element.namespaceURI
+  - api.Element.nextElementSibling
+  - api.Element.prefix
+  - api.Element.prepend
+  - api.Element.previousElementSibling
+  - api.Element.querySelector
+  - api.Element.querySelectorAll
+  - api.Element.remove
+  - api.Element.removeAttribute
+  - api.Element.removeAttributeNS
+  - api.Element.removeAttributeNode
+  - api.Element.replaceChildren
+  - api.Element.replaceWith
+  - api.Element.setAttribute
+  - api.Element.setAttributeNS
+  - api.Element.setAttributeNode
+  - api.Element.setAttributeNodeNS
+  - api.Element.tagName
+  - api.Element.toggleAttribute
+  - api.HTMLCollection
+  - api.HTMLCollection.item
+  - api.HTMLCollection.length
+  - api.HTMLCollection.namedItem
+  - api.HTMLDocument
+  - api.HTMLElement
+  - api.HTMLElement.dir
+  - api.HTMLElement.hidden
+  - api.HTMLElement.innerText
+  - api.HTMLElement.outerText
+  - api.NamedNodeMap
+  - api.NamedNodeMap.getNamedItem
+  - api.NamedNodeMap.getNamedItemNS
+  - api.NamedNodeMap.item
+  - api.NamedNodeMap.length
+  - api.NamedNodeMap.removeNamedItem
+  - api.NamedNodeMap.removeNamedItemNS
+  - api.NamedNodeMap.setNamedItem
+  - api.NamedNodeMap.setNamedItemNS
+  - api.Node
+  - api.Node.appendChild
+  - api.Node.baseURI
+  - api.Node.childNodes
+  - api.Node.cloneNode
+  - api.Node.compareDocumentPosition
+  - api.Node.contains
+  - api.Node.firstChild
+  - api.Node.hasChildNodes
+  - api.Node.insertBefore
+  - api.Node.isDefaultNamespace
+  - api.Node.isEqualNode
+  - api.Node.isSameNode
+  - api.Node.lastChild
+  - api.Node.lookupNamespaceURI
+  - api.Node.lookupPrefix
+  - api.Node.nextSibling
+  - api.Node.nodeName
+  - api.Node.nodeType
+  - api.Node.nodeValue
+  - api.Node.normalize
+  - api.Node.ownerDocument
+  - api.Node.parentElement
+  - api.Node.parentNode
+  - api.Node.previousSibling
+  - api.Node.removeChild
+  - api.Node.replaceChild
+  - api.Node.textContent
+  - api.NodeIterator
+  - api.NodeIterator.filter
+  - api.NodeIterator.nextNode
+  - api.NodeIterator.pointerBeforeReferenceNode
+  - api.NodeIterator.previousNode
+  - api.NodeIterator.referenceNode
+  - api.NodeIterator.root
+  - api.NodeIterator.whatToShow
+  - api.NodeList
+  - api.NodeList.@@iterator
+  - api.NodeList.entries
+  - api.NodeList.forEach
+  - api.NodeList.item
+  - api.NodeList.keys
+  - api.NodeList.length
+  - api.NodeList.values
+  - api.ProcessingInstruction
+  - api.ProcessingInstruction.target
+  - api.Text
+  - api.Text.Text
+  - api.Text.splitText
+  - api.Text.wholeText
+  - api.TreeWalker
+  - api.TreeWalker.currentNode
+  - api.TreeWalker.filter
+  - api.TreeWalker.firstChild
+  - api.TreeWalker.lastChild
+  - api.TreeWalker.nextNode
+  - api.TreeWalker.nextSibling
+  - api.TreeWalker.parentNode
+  - api.TreeWalker.previousNode
+  - api.TreeWalker.previousSibling
+  - api.TreeWalker.root
+  - api.TreeWalker.whatToShow
+  - api.XMLDocument
diff --git a/features/dom.yml.dist b/features/dom.yml.dist
new file mode 100644
index 00000000000..f29173aabc0
--- /dev/null
+++ b/features/dom.yml.dist
@@ -0,0 +1,1198 @@
+# Generated from: dom.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "1"
+    safari_ios: "1"
+compat_features:
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Attr
+  - api.Attr.localName
+  - api.Attr.name
+  - api.Attr.namespaceURI
+  - api.Attr.ownerElement
+  - api.Attr.prefix
+  - api.Attr.value
+  - api.CharacterData
+  - api.CharacterData.appendData
+  - api.CharacterData.data
+  - api.CharacterData.deleteData
+  - api.CharacterData.insertData
+  - api.CharacterData.length
+  - api.CharacterData.replaceData
+  - api.CharacterData.substringData
+  - api.DOMImplementation
+  - api.DOMImplementation.createDocument
+  - api.DOMImplementation.createDocumentType
+  - api.Document
+  - api.Document.URL
+  - api.Document.createAttribute
+  - api.Document.createAttributeNS
+  - api.Document.createCDATASection
+  - api.Document.createComment
+  - api.Document.createDocumentFragment
+  - api.Document.createElement
+  - api.Document.createElementNS
+  - api.Document.createProcessingInstruction
+  - api.Document.createTextNode
+  - api.Document.defaultView
+  - api.Document.doctype
+  - api.Document.documentElement
+  - api.Document.forms
+  - api.Document.getElementById
+  - api.Document.getElementsByName
+  - api.Document.getElementsByTagName
+  - api.Document.getElementsByTagNameNS
+  - api.Document.images
+  - api.Document.implementation
+  - api.Document.importNode
+  - api.Document.lastModified
+  - api.Document.links
+  - api.Document.referrer
+  - api.Document.title
+  - api.Element
+  - api.Element.attributes
+  - api.Element.getAttribute
+  - api.Element.getAttributeNS
+  - api.Element.getAttributeNode
+  - api.Element.getAttributeNodeNS
+  - api.Element.getElementsByTagName
+  - api.Element.getElementsByTagName.all_elements_selector
+  - api.Element.getElementsByTagNameNS
+  - api.Element.getElementsByTagNameNS.all_elements_selector
+  - api.Element.hasAttribute
+  - api.Element.hasAttributeNS
+  - api.Element.hasAttributes
+  - api.Element.innerHTML
+  - api.Element.localName
+  - api.Element.namespaceURI
+  - api.Element.prefix
+  - api.Element.removeAttribute
+  - api.Element.removeAttributeNS
+  - api.Element.removeAttributeNode
+  - api.Element.setAttribute
+  - api.Element.setAttributeNS
+  - api.Element.setAttributeNode
+  - api.Element.setAttributeNodeNS
+  - api.Element.tagName
+  - api.HTMLCollection
+  - api.HTMLCollection.item
+  - api.HTMLCollection.length
+  - api.HTMLCollection.namedItem
+  - api.HTMLDocument
+  - api.HTMLElement
+  - api.Node
+  - api.Node.firstChild
+  - api.Node.hasChildNodes
+  - api.Node.nodeName
+  - api.Node.nodeValue
+  - api.Node.normalize
+  - api.Node.ownerDocument
+  - api.Node.previousSibling
+  - api.NodeList
+  - api.NodeList.item
+  - api.NodeList.length
+  - api.ProcessingInstruction
+  - api.ProcessingInstruction.target
+  - api.Text
+  - api.Text.splitText
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1.1"
+  #   safari_ios: "1"
+  - api.Node.appendChild
+  - api.Node.cloneNode
+  - api.Node.insertBefore
+  - api.Node.nextSibling
+  - api.Node.nodeType
+  - api.Node.parentNode
+  - api.Node.removeChild
+  - api.Node.replaceChild
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1.2"
+  #   safari_ios: "1"
+  - api.Node.childNodes
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.CDATASection
+  - api.Comment
+  - api.Document.adoptNode
+  - api.Document.characterSet
+  - api.Document.createNodeIterator
+  - api.DocumentFragment
+  - api.DocumentType
+  - api.DocumentType.name
+  - api.DocumentType.publicId
+  - api.DocumentType.systemId
+  - api.HTMLElement.dir
+  - api.Node.isDefaultNamespace
+  - api.Node.isEqualNode
+  - api.Node.lookupNamespaceURI
+  - api.Node.lookupPrefix
+  - api.Node.textContent
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "3"
+  - api.Document.createTreeWalker
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "2"
+  - api.Document.DOMContentLoaded_event
+  - api.Document.compatMode
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "5.1"
+  #   safari_ios: "5"
+  - api.DOMStringList
+  - api.DOMStringList.item
+  - api.DOMStringList.length
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: ≤4
+  #   safari_ios: "1"
+  - api.Node.baseURI
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1.5"
+  #   firefox_android: "4"
+  #   safari: "5.1"
+  #   safari_ios: "5"
+  - api.DOMStringList.contains
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "2"
+  - api.Document.getElementsByClassName
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.5"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "3"
+  - api.NodeIterator
+  - api.NodeIterator.filter
+  - api.NodeIterator.nextNode
+  - api.NodeIterator.previousNode
+  - api.NodeIterator.root
+  - api.NodeIterator.whatToShow
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.5"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "2"
+  - api.Document.querySelector
+  - api.Document.querySelectorAll
+  - api.Element.querySelector
+  - api.Element.querySelectorAll
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.5"
+  #   firefox_android: "4"
+  #   safari: "4"
+  #   safari_ios: "3"
+  - api.Element.children
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.6"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Document.readyState
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "4"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.DOMImplementation.createHTMLDocument
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "4"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "3"
+  - api.TreeWalker
+  - api.TreeWalker.currentNode
+  - api.TreeWalker.filter
+  - api.TreeWalker.firstChild
+  - api.TreeWalker.lastChild
+  - api.TreeWalker.nextNode
+  - api.TreeWalker.nextSibling
+  - api.TreeWalker.parentNode
+  - api.TreeWalker.previousNode
+  - api.TreeWalker.previousSibling
+  - api.TreeWalker.root
+  - api.TreeWalker.whatToShow
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "9"
+  #   firefox_android: "9"
+  #   safari: "1.1"
+  #   safari_ios: "1"
+  - api.Node.parentElement
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "9"
+  #   firefox_android: "9"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Document.scripts
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "11"
+  #   firefox_android: "14"
+  #   safari: "1.3"
+  #   safari_ios: "1"
+  - api.Element.outerHTML
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "34"
+  #   firefox_android: "34"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.NamedNodeMap
+  - api.NamedNodeMap.getNamedItem
+  - api.NamedNodeMap.getNamedItemNS
+  - api.NamedNodeMap.item
+  - api.NamedNodeMap.length
+  - api.NamedNodeMap.removeNamedItem
+  - api.NamedNodeMap.removeNamedItemNS
+  - api.NamedNodeMap.setNamedItem
+  - api.NamedNodeMap.setNamedItemNS
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "2"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "4"
+  #   safari_ios: "3.2"
+  - api.Node.compareDocumentPosition
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "2"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3"
+  #   firefox_android: "4"
+  #   safari: "4"
+  #   safari_ios: "3.2"
+  - api.Document.activeElement
+  - api.Document.hasFocus
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "2"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.5"
+  #   firefox_android: "4"
+  #   safari: "4"
+  #   safari_ios: "3"
+  - api.DocumentFragment.querySelector
+  - api.DocumentFragment.querySelectorAll
+  - api.Element.childElementCount
+  - api.Element.firstElementChild
+  - api.Element.lastElementChild
+  - api.Element.nextElementSibling
+  - api.Element.previousElementSibling
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "2"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.5"
+  #   firefox_android: "4"
+  #   safari: "4"
+  #   safari_ios: "3.2"
+  - api.Text.wholeText
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "4"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "4"
+  #   firefox_android: "4"
+  #   safari: "5"
+  #   safari_ios: "4"
+  - api.Document.head
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "6"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "4"
+  #   firefox_android: "4"
+  #   safari: "5.1"
+  #   safari_ios: "5"
+  - api.HTMLElement.hidden
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "8"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.6"
+  #   firefox_android: "4"
+  #   safari: "5.1"
+  #   safari_ios: "5"
+  - api.DOMTokenList
+  - api.DOMTokenList.add
+  - api.DOMTokenList.contains
+  - api.DOMTokenList.item
+  - api.DOMTokenList.length
+  - api.DOMTokenList.remove
+  - api.DOMTokenList.toString
+  - api.DOMTokenList.toggle
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "9"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "4"
+  #   firefox_android: "4"
+  #   safari: "5.1"
+  #   safari_ios: "5"
+  - api.Document.readystatechange_event
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "16"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "9"
+  #   firefox_android: "9"
+  #   safari: "1.1"
+  #   safari_ios: "1"
+  - api.Node.contains
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "22"
+  #   chrome_android: "25"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Element.className
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "23"
+  #   chrome_android: "25"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Element.id
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "24"
+  #   chrome_android: "25"
+  #   edge: "12"
+  #   firefox: "23"
+  #   firefox_android: "23"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.CharacterData.remove
+  - api.DocumentType.remove
+  - api.Element.remove
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "24"
+  #   chrome_android: "25"
+  #   edge: "12"
+  #   firefox: "24"
+  #   firefox_android: "24"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.DOMTokenList.toggle.force_parameter
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "24"
+  #   chrome_android: "25"
+  #   edge: "12"
+  #   firefox: "26"
+  #   firefox_android: "26"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.DOMTokenList.add.multiple_parameters
+  - api.DOMTokenList.remove.multiple_parameters
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "29"
+  #   chrome_android: "29"
+  #   edge: "12"
+  #   firefox: "4"
+  #   firefox_android: "4"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - api.Document.currentScript
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "33"
+  #   chrome_android: "33"
+  #   edge: "12"
+  #   firefox: "18"
+  #   firefox_android: "18"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.Document.hidden
+  - api.Document.visibilityState
+
+  # baseline: high
+  # baseline_low_date: 2015-11-12
+  # baseline_high_date: 2018-05-12
+  # support:
+  #   chrome: "4"
+  #   chrome_android: "18"
+  #   edge: "13"
+  #   firefox: "12"
+  #   firefox_android: "14"
+  #   safari: "3"
+  #   safari_ios: "3"
+  - api.Document.createTreeWalker.whatToShow_filter_parameters_optional
+
+  # baseline: high
+  # baseline_low_date: 2016-03-08
+  # baseline_high_date: 2018-09-08
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "45"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Node.lastChild
+
+  # baseline: high
+  # baseline_low_date: 2016-03-08
+  # baseline_high_date: 2018-09-08
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "45"
+  #   firefox_android: "45"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.HTMLElement.innerText
+
+  # baseline: high
+  # baseline_low_date: 2016-08-02
+  # baseline_high_date: 2019-02-02
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "48"
+  #   firefox_android: "48"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Node.isSameNode
+
+  # baseline: high
+  # baseline_low_date: 2016-09-20
+  # baseline_high_date: 2019-03-20
+  # support:
+  #   chrome: "34"
+  #   chrome_android: "34"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.XMLDocument
+
+  # baseline: high
+  # baseline_low_date: 2017-01-24
+  # baseline_high_date: 2019-07-24
+  # support:
+  #   chrome: "48"
+  #   chrome_android: "48"
+  #   edge: "12"
+  #   firefox: "51"
+  #   firefox_android: "51"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.DOMTokenList.trim_whitespace
+
+  # baseline: high
+  # baseline_low_date: 2017-04-05
+  # baseline_high_date: 2019-10-05
+  # support:
+  #   chrome: "33"
+  #   chrome_android: "33"
+  #   edge: "15"
+  #   firefox: "34"
+  #   firefox_android: "34"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - api.Element.matches
+
+  # baseline: high
+  # baseline_low_date: 2017-04-05
+  # baseline_high_date: 2019-10-05
+  # support:
+  #   chrome: "41"
+  #   chrome_android: "41"
+  #   edge: "15"
+  #   firefox: "35"
+  #   firefox_android: "35"
+  #   safari: "6"
+  #   safari_ios: "9"
+  - api.Element.closest
+
+  # baseline: high
+  # baseline_low_date: 2017-10-17
+  # baseline_high_date: 2020-04-17
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "16"
+  #   firefox: "3"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "2"
+  - api.Element.getElementsByClassName
+
+  # baseline: high
+  # baseline_low_date: 2017-10-17
+  # baseline_high_date: 2020-04-17
+  # support:
+  #   chrome: "22"
+  #   chrome_android: "25"
+  #   edge: "16"
+  #   firefox: "3.6"
+  #   firefox_android: "4"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.Element.classList
+
+  # baseline: high
+  # baseline_low_date: 2017-10-17
+  # baseline_high_date: 2020-04-17
+  # support:
+  #   chrome: "29"
+  #   chrome_android: "29"
+  #   edge: "16"
+  #   firefox: "24"
+  #   firefox_android: "24"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - api.Comment.Comment
+  - api.Text.Text
+
+  # baseline: high
+  # baseline_low_date: 2017-10-17
+  # baseline_high_date: 2020-04-17
+  # support:
+  #   chrome: "29"
+  #   chrome_android: "29"
+  #   edge: "16"
+  #   firefox: "25"
+  #   firefox_android: "25"
+  #   safari: "9"
+  #   safari_ios: "9"
+  - api.Document.children
+  - api.DocumentFragment.children
+
+  # baseline: high
+  # baseline_low_date: 2017-10-17
+  # baseline_high_date: 2020-04-17
+  # support:
+  #   chrome: "42"
+  #   chrome_android: "42"
+  #   edge: "16"
+  #   firefox: "36"
+  #   firefox_android: "36"
+  #   safari: "10.1"
+  #   safari_ios: "10.3"
+  - api.DOMTokenList.@@iterator
+
+  # baseline: high
+  # baseline_low_date: 2017-10-17
+  # baseline_high_date: 2020-04-17
+  # support:
+  #   chrome: "42"
+  #   chrome_android: "42"
+  #   edge: "16"
+  #   firefox: "50"
+  #   firefox_android: "50"
+  #   safari: "10.1"
+  #   safari_ios: "10.3"
+  - api.DOMTokenList.entries
+  - api.DOMTokenList.forEach
+  - api.DOMTokenList.keys
+  - api.DOMTokenList.values
+
+  # baseline: high
+  # baseline_low_date: 2017-10-17
+  # baseline_high_date: 2020-04-17
+  # support:
+  #   chrome: "51"
+  #   chrome_android: "51"
+  #   edge: "16"
+  #   firefox: "50"
+  #   firefox_android: "50"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.NodeList.entries
+  - api.NodeList.forEach
+  - api.NodeList.keys
+  - api.NodeList.values
+
+  # baseline: high
+  # baseline_low_date: 2018-01-23
+  # baseline_high_date: 2020-07-23
+  # support:
+  #   chrome: "64"
+  #   chrome_android: "64"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "10.1"
+  #   safari_ios: "10.3"
+  - api.Document.dir
+  - api.Document.embeds
+  - api.Document.plugins
+
+  # baseline: high
+  # baseline_low_date: 2018-01-23
+  # baseline_high_date: 2020-07-23
+  # support:
+  #   chrome: "64"
+  #   chrome_android: "64"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "11"
+  #   safari_ios: "11"
+  - api.Document.close
+  - api.Document.open
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "17"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Document.documentURI
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "17"
+  #   firefox: "3.5"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "3"
+  - api.NodeIterator.pointerBeforeReferenceNode
+  - api.NodeIterator.referenceNode
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "17"
+  #   firefox: "8"
+  #   firefox_android: "8"
+  #   safari: "4"
+  #   safari_ios: "4"
+  - api.Element.insertAdjacentHTML
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "17"
+  #   firefox: "48"
+  #   firefox_android: "48"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Element.insertAdjacentElement
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "17"
+  #   firefox: "48"
+  #   firefox_android: "48"
+  #   safari: "4"
+  #   safari_ios: "4"
+  - api.Element.insertAdjacentText
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "29"
+  #   chrome_android: "29"
+  #   edge: "17"
+  #   firefox: "24"
+  #   firefox_android: "24"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - api.DocumentFragment.DocumentFragment
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "29"
+  #   chrome_android: "29"
+  #   edge: "17"
+  #   firefox: "25"
+  #   firefox_android: "25"
+  #   safari: "9"
+  #   safari_ios: "9"
+  - api.CharacterData.nextElementSibling
+  - api.CharacterData.previousElementSibling
+  - api.Document.childElementCount
+  - api.Document.firstElementChild
+  - api.Document.lastElementChild
+  - api.DocumentFragment.childElementCount
+  - api.DocumentFragment.firstElementChild
+  - api.DocumentFragment.lastElementChild
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "36"
+  #   chrome_android: "36"
+  #   edge: "17"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "9"
+  #   safari_ios: "9"
+  - api.Document.contentType
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "36"
+  #   chrome_android: "36"
+  #   edge: "17"
+  #   firefox: "28"
+  #   firefox_android: "28"
+  #   safari: "9"
+  #   safari_ios: "9"
+  - api.DocumentFragment.getElementById
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "49"
+  #   chrome_android: "49"
+  #   edge: "17"
+  #   firefox: "49"
+  #   firefox_android: "49"
+  #   safari: "10.1"
+  #   safari_ios: "10.3"
+  - api.DOMTokenList.supports
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "50"
+  #   chrome_android: "50"
+  #   edge: "17"
+  #   firefox: "47"
+  #   firefox_android: "47"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.DOMTokenList.value
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "54"
+  #   chrome_android: "54"
+  #   edge: "17"
+  #   firefox: "49"
+  #   firefox_android: "49"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.CharacterData.after
+  - api.CharacterData.before
+  - api.CharacterData.replaceWith
+  - api.Document.append
+  - api.Document.prepend
+  - api.DocumentFragment.append
+  - api.DocumentFragment.prepend
+  - api.DocumentType.after
+  - api.DocumentType.before
+  - api.DocumentType.replaceWith
+  - api.Element.after
+  - api.Element.append
+  - api.Element.before
+  - api.Element.prepend
+  - api.Element.replaceWith
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "60"
+  #   chrome_android: "60"
+  #   edge: "17"
+  #   firefox: "20"
+  #   firefox_android: "20"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - api.Document.Document
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "60"
+  #   chrome_android: "60"
+  #   edge: "17"
+  #   firefox: "55"
+  #   firefox_android: "55"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.DOMTokenList.remove_duplicates
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "61"
+  #   chrome_android: "61"
+  #   edge: "17"
+  #   firefox: "49"
+  #   firefox_android: "49"
+  #   safari: "10.1"
+  #   safari_ios: "10.3"
+  - api.DOMTokenList.replace
+
+  # baseline: high
+  # baseline_low_date: 2018-05-09
+  # baseline_high_date: 2020-11-09
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "60"
+  #   firefox_android: "60"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Document.body
+
+  # baseline: high
+  # baseline_low_date: 2018-10-02
+  # baseline_high_date: 2021-04-02
+  # support:
+  #   chrome: "61"
+  #   chrome_android: "61"
+  #   edge: "18"
+  #   firefox: "45"
+  #   firefox_android: "45"
+  #   safari: "10.1"
+  #   safari_ios: "10.3"
+  - api.Element.getAttributeNames
+
+  # baseline: high
+  # baseline_low_date: 2018-10-02
+  # baseline_high_date: 2021-04-02
+  # support:
+  #   chrome: "67"
+  #   chrome_android: "67"
+  #   edge: "18"
+  #   firefox: "61"
+  #   firefox_android: "61"
+  #   safari: "12"
+  #   safari_ios: "12"
+  - api.DOMTokenList.replace.boolean_value
+
+  # baseline: high
+  # baseline_low_date: 2018-10-23
+  # baseline_high_date: 2021-04-23
+  # support:
+  #   chrome: "69"
+  #   chrome_android: "69"
+  #   edge: "18"
+  #   firefox: "63"
+  #   firefox_android: "63"
+  #   safari: "12"
+  #   safari_ios: "12"
+  - api.Element.toggleAttribute
+
+  # baseline: high
+  # baseline_low_date: 2020-01-15
+  # baseline_high_date: 2022-07-15
+  # support:
+  #   chrome: "51"
+  #   chrome_android: "51"
+  #   edge: "79"
+  #   firefox: "36"
+  #   firefox_android: "36"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.NodeList.@@iterator
+
+  # baseline: high
+  # baseline_low_date: 2020-10-20
+  # baseline_high_date: 2023-04-20
+  # support:
+  #   chrome: "86"
+  #   chrome_android: "86"
+  #   edge: "86"
+  #   firefox: "78"
+  #   firefox_android: "79"
+  #   safari: "14"
+  #   safari_ios: "14"
+  - api.Document.replaceChildren
+  - api.DocumentFragment.replaceChildren
+  - api.Element.replaceChildren
+
+  # baseline: high
+  # baseline_low_date: 2021-04-26
+  # baseline_high_date: 2023-10-26
+  # support:
+  #   chrome: "62"
+  #   chrome_android: "62"
+  #   edge: "18"
+  #   firefox: "56"
+  #   firefox_android: "56"
+  #   safari: "14.1"
+  #   safari_ios: "14.5"
+  - api.Document.visibilitychange_event
+
+  # baseline: high
+  # baseline_low_date: 2022-03-08
+  # baseline_high_date: 2024-09-08
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "98"
+  #   firefox_android: "98"
+  #   safari: "1.3"
+  #   safari_ios: "1"
+  - api.HTMLElement.outerText
diff --git a/features/events.yml b/features/events.yml
new file mode 100644
index 00000000000..bf9bc08d9b1
--- /dev/null
+++ b/features/events.yml
@@ -0,0 +1,33 @@
+name: Events
+description: Events fire when significant things happen in the page, such as an image loading or a user clicking. You can use the `addEventListener()` method on objects that receive events (event targets), such as windows, documents, and elements, to set a function to be called when an event fires.
+spec:
+  - https://html.spec.whatwg.org/multipage/indices.html#events-2
+  - https://dom.spec.whatwg.org/#interface-customevent
+  - https://dom.spec.whatwg.org/#interface-eventtarget
+compat_features:
+  - api.CustomEvent
+  - api.CustomEvent.CustomEvent
+  - api.CustomEvent.detail
+  - api.Event
+  - api.Event.Event
+  - api.Event.bubbles
+  - api.Event.cancelable
+  - api.Event.currentTarget
+  - api.Event.defaultPrevented
+  - api.Event.eventPhase
+  - api.Event.isTrusted
+  - api.Event.preventDefault
+  - api.Event.stopImmediatePropagation
+  - api.Event.stopPropagation
+  - api.Event.target
+  - api.Event.timeStamp
+  - api.Event.type
+  - api.EventTarget
+  - api.EventTarget.EventTarget
+  - api.EventTarget.addEventListener
+  - api.EventTarget.addEventListener.options_parameter.options_capture_parameter
+  - api.EventTarget.addEventListener.options_parameter.options_once_parameter
+  - api.EventTarget.addEventListener.options_parameter.options_passive_parameter
+  - api.EventTarget.addEventListener.options_parameter.options_signal_parameter
+  - api.EventTarget.dispatchEvent
+  - api.EventTarget.removeEventListener
diff --git a/features/events.yml.dist b/features/events.yml.dist
new file mode 100644
index 00000000000..b297e530ee4
--- /dev/null
+++ b/features/events.yml.dist
@@ -0,0 +1,186 @@
+# Generated from: events.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2021-09-20
+  baseline_high_date: 2024-03-20
+  support:
+    chrome: "90"
+    chrome_android: "90"
+    edge: "90"
+    firefox: "86"
+    firefox_android: "86"
+    safari: "15"
+    safari_ios: "15"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Event
+  - api.Event.currentTarget
+  - api.Event.preventDefault
+  - api.Event.stopPropagation
+  - api.Event.target
+  - api.EventTarget
+  - api.EventTarget.addEventListener
+  - api.EventTarget.removeEventListener
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1.5"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Event.bubbles
+  - api.Event.cancelable
+  - api.Event.eventPhase
+  - api.Event.timeStamp
+  - api.Event.type
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "4"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "2"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "3"
+  - api.EventTarget.dispatchEvent
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "5"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "6"
+  #   firefox_android: "6"
+  #   safari: "5"
+  #   safari_ios: "5"
+  - api.CustomEvent
+  - api.CustomEvent.detail
+  - api.Event.defaultPrevented
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "5"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "10"
+  #   firefox_android: "10"
+  #   safari: "5"
+  #   safari_ios: "5"
+  - api.Event.stopImmediatePropagation
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "15"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "11"
+  #   firefox_android: "14"
+  #   safari: "6"
+  #   safari_ios: "6"
+  - api.CustomEvent.CustomEvent
+  - api.Event.Event
+
+  # baseline: high
+  # baseline_low_date: 2016-09-20
+  # baseline_high_date: 2019-03-20
+  # support:
+  #   chrome: "46"
+  #   chrome_android: "46"
+  #   edge: "12"
+  #   firefox: "1.5"
+  #   firefox_android: "4"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.Event.isTrusted
+
+  # baseline: high
+  # baseline_low_date: ≤2018-10-02
+  # baseline_high_date: ≤2021-04-02
+  # support:
+  #   chrome: "51"
+  #   chrome_android: "51"
+  #   edge: ≤18
+  #   firefox: "49"
+  #   firefox_android: "49"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.EventTarget.addEventListener.options_parameter.options_passive_parameter
+
+  # baseline: high
+  # baseline_low_date: ≤2018-10-02
+  # baseline_high_date: ≤2021-04-02
+  # support:
+  #   chrome: "52"
+  #   chrome_android: "52"
+  #   edge: ≤18
+  #   firefox: "49"
+  #   firefox_android: "49"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.EventTarget.addEventListener.options_parameter.options_capture_parameter
+
+  # baseline: high
+  # baseline_low_date: ≤2018-10-02
+  # baseline_high_date: ≤2021-04-02
+  # support:
+  #   chrome: "55"
+  #   chrome_android: "55"
+  #   edge: ≤18
+  #   firefox: "50"
+  #   firefox_android: "50"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - api.EventTarget.addEventListener.options_parameter.options_once_parameter
+
+  # baseline: high
+  # baseline_low_date: 2020-09-16
+  # baseline_high_date: 2023-03-16
+  # support:
+  #   chrome: "64"
+  #   chrome_android: "64"
+  #   edge: "79"
+  #   firefox: "59"
+  #   firefox_android: "59"
+  #   safari: "14"
+  #   safari_ios: "14"
+  - api.EventTarget.EventTarget
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2021-09-20
+  # baseline_high_date: 2024-03-20
+  # support:
+  #   chrome: "90"
+  #   chrome_android: "90"
+  #   edge: "90"
+  #   firefox: "86"
+  #   firefox_android: "86"
+  #   safari: "15"
+  #   safari_ios: "15"
+  - api.EventTarget.addEventListener.options_parameter.options_signal_parameter
diff --git a/features/mutationobserver.yml b/features/mutationobserver.yml
new file mode 100644
index 00000000000..3122ec39a43
--- /dev/null
+++ b/features/mutationobserver.yml
@@ -0,0 +1,19 @@
+name: MutationObserver
+description: The `MutationObserver` API watches for changes to the DOM tree and calls a callback function when DOM changes occur.
+spec: https://dom.spec.whatwg.org/#interface-mutationobserver
+compat_features:
+  - api.MutationObserver
+  - api.MutationObserver.MutationObserver
+  - api.MutationObserver.disconnect
+  - api.MutationObserver.observe
+  - api.MutationObserver.takeRecords
+  - api.MutationRecord
+  - api.MutationRecord.addedNodes
+  - api.MutationRecord.attributeName
+  - api.MutationRecord.attributeNamespace
+  - api.MutationRecord.nextSibling
+  - api.MutationRecord.oldValue
+  - api.MutationRecord.previousSibling
+  - api.MutationRecord.removedNodes
+  - api.MutationRecord.target
+  - api.MutationRecord.type
diff --git a/features/mutationobserver.yml.dist b/features/mutationobserver.yml.dist
new file mode 100644
index 00000000000..dc40c1ff2fa
--- /dev/null
+++ b/features/mutationobserver.yml.dist
@@ -0,0 +1,55 @@
+# Generated from: mutationobserver.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "26"
+    chrome_android: "26"
+    edge: "12"
+    firefox: "14"
+    firefox_android: "14"
+    safari: "7"
+    safari_ios: "7"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "16"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "14"
+  #   firefox_android: "14"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.MutationRecord
+  - api.MutationRecord.addedNodes
+  - api.MutationRecord.attributeName
+  - api.MutationRecord.attributeNamespace
+  - api.MutationRecord.nextSibling
+  - api.MutationRecord.oldValue
+  - api.MutationRecord.previousSibling
+  - api.MutationRecord.removedNodes
+  - api.MutationRecord.target
+  - api.MutationRecord.type
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "26"
+  #   chrome_android: "26"
+  #   edge: "12"
+  #   firefox: "14"
+  #   firefox_android: "14"
+  #   safari: "7"
+  #   safari_ios: "7"
+  - api.MutationObserver
+  - api.MutationObserver.MutationObserver
+  - api.MutationObserver.disconnect
+  - api.MutationObserver.observe
+  - api.MutationObserver.takeRecords
diff --git a/features/selection-api.yml b/features/selection-api.yml
index 851119714ad..2461cada8fa 100644
--- a/features/selection-api.yml
+++ b/features/selection-api.yml
@@ -9,8 +9,44 @@ status:
     - api.Window.getSelection
     - api.Document.selectionchange_event
 compat_features:
+  - api.AbstractRange
+  - api.AbstractRange.collapsed
+  - api.AbstractRange.endContainer
+  - api.AbstractRange.endOffset
+  - api.AbstractRange.startContainer
+  - api.AbstractRange.startOffset
+  - api.Document.createRange
   - api.Document.getSelection
   - api.Document.selectionchange_event
+  - api.Range
+  - api.Range.Range
+  - api.Range.cloneContents
+  - api.Range.cloneRange
+  - api.Range.collapse
+  - api.Range.collapsed
+  - api.Range.commonAncestorContainer
+  - api.Range.compareBoundaryPoints
+  - api.Range.comparePoint
+  - api.Range.deleteContents
+  - api.Range.detach
+  - api.Range.endContainer
+  - api.Range.endOffset
+  - api.Range.extractContents
+  - api.Range.insertNode
+  - api.Range.intersectsNode
+  - api.Range.isPointInRange
+  - api.Range.selectNode
+  - api.Range.selectNodeContents
+  - api.Range.setEnd
+  - api.Range.setEndAfter
+  - api.Range.setEndBefore
+  - api.Range.setStart
+  - api.Range.setStartAfter
+  - api.Range.setStartBefore
+  - api.Range.startContainer
+  - api.Range.startOffset
+  - api.Range.surroundContents
+  - api.Range.toString
   - api.Selection
   - api.Selection.addRange
   - api.Selection.anchorNode
@@ -56,3 +92,11 @@ compat_features:
   # removeRange is baseline low because it was only added in Safari 17.
   # Maybe split into a separate feature.
   - api.Selection.removeRange
+
+  - api.StaticRange
+  - api.StaticRange.StaticRange
+  - api.StaticRange.collapsed
+  - api.StaticRange.endContainer
+  - api.StaticRange.endOffset
+  - api.StaticRange.startContainer
+  - api.StaticRange.startOffset
diff --git a/features/selection-api.yml.dist b/features/selection-api.yml.dist
index 6b67dd5b6f9..36569b32bd0 100644
--- a/features/selection-api.yml.dist
+++ b/features/selection-api.yml.dist
@@ -25,6 +25,31 @@ compat_features:
   #   firefox_android: "4"
   #   safari: "1"
   #   safari_ios: "1"
+  - api.Document.createRange
+  - api.Range
+  - api.Range.cloneContents
+  - api.Range.cloneRange
+  - api.Range.collapse
+  - api.Range.collapsed
+  - api.Range.commonAncestorContainer
+  - api.Range.compareBoundaryPoints
+  - api.Range.deleteContents
+  - api.Range.endContainer
+  - api.Range.endOffset
+  - api.Range.extractContents
+  - api.Range.insertNode
+  - api.Range.selectNode
+  - api.Range.selectNodeContents
+  - api.Range.setEnd
+  - api.Range.setEndAfter
+  - api.Range.setEndBefore
+  - api.Range.setStart
+  - api.Range.setStartAfter
+  - api.Range.setStartBefore
+  - api.Range.startContainer
+  - api.Range.startOffset
+  - api.Range.surroundContents
+  - api.Range.toString
   - api.Window.getSelection
 
   # baseline: high
@@ -108,6 +133,32 @@ compat_features:
   #   safari_ios: "5"
   - api.Document.selectionchange_event
 
+  # baseline: high
+  # baseline_low_date: 2017-04-05
+  # baseline_high_date: 2019-10-05
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "15"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Range.isPointInRange
+
+  # baseline: high
+  # baseline_low_date: 2017-04-05
+  # baseline_high_date: 2019-10-05
+  # support:
+  #   chrome: "29"
+  #   chrome_android: "29"
+  #   edge: "15"
+  #   firefox: "24"
+  #   firefox_android: "24"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - api.Range.Range
+
   # baseline: high
   # baseline_low_date: 2017-04-19
   # baseline_high_date: 2019-10-19
@@ -160,6 +211,32 @@ compat_features:
   #   safari_ios: "1"
   - api.Selection.type
 
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "17"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Range.comparePoint
+
+  # baseline: high
+  # baseline_low_date: 2018-04-30
+  # baseline_high_date: 2020-10-30
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "17"
+  #   firefox: "17"
+  #   firefox_android: "19"
+  #   safari: "3"
+  #   safari_ios: "1"
+  - api.Range.intersectsNode
+
   # baseline: high
   # baseline_low_date: 2020-01-15
   # baseline_high_date: 2022-07-15
@@ -173,6 +250,55 @@ compat_features:
   #   safari_ios: "1"
   - api.Selection.modify
 
+  # baseline: high
+  # baseline_low_date: 2020-07-28
+  # baseline_high_date: 2023-01-28
+  # support:
+  #   chrome: "60"
+  #   chrome_android: "60"
+  #   edge: "18"
+  #   firefox: "69"
+  #   firefox_android: "79"
+  #   safari: "10.1"
+  #   safari_ios: "10.3"
+  - api.StaticRange
+  - api.StaticRange.collapsed
+  - api.StaticRange.endContainer
+  - api.StaticRange.endOffset
+  - api.StaticRange.startContainer
+  - api.StaticRange.startOffset
+
+  # baseline: high
+  # baseline_low_date: 2021-04-15
+  # baseline_high_date: 2023-10-15
+  # support:
+  #   chrome: "90"
+  #   chrome_android: "90"
+  #   edge: "90"
+  #   firefox: "71"
+  #   firefox_android: "79"
+  #   safari: "13.1"
+  #   safari_ios: "13.4"
+  - api.StaticRange.StaticRange
+
+  # baseline: high
+  # baseline_low_date: 2021-04-26
+  # baseline_high_date: 2023-10-26
+  # support:
+  #   chrome: "90"
+  #   chrome_android: "90"
+  #   edge: "90"
+  #   firefox: "69"
+  #   firefox_android: "79"
+  #   safari: "14.1"
+  #   safari_ios: "14.5"
+  - api.AbstractRange
+  - api.AbstractRange.collapsed
+  - api.AbstractRange.endContainer
+  - api.AbstractRange.endOffset
+  - api.AbstractRange.startContainer
+  - api.AbstractRange.startOffset
+
   # baseline: low
   # baseline_low_date: 2023-09-18
   # support:
@@ -195,6 +321,15 @@ compat_features:
   #   safari: "1.3"
   - api.Node.selectstart_event
 
+  # baseline: false
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - api.Range.detach
+
   # baseline: false
   # support:
   #   firefox: "126"