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Custom Elements

Custom elements is a feature that, until recently, was developed as monkeypatches onto various specifications. To help implementers have a consolidated view of how custom elements change the HTML Standard, we have a few resources.

First we have this listing of affected sections:

• Elements in the DOM:
  • The HTMLElement constructor
  • The definition of "element interface"
• Custom elements
• Window got a new customElements attribute
• Creating and inserting nodes: create an element for a token
• The XHTML syntax now mentions that "create an element for a token" must be used.
• Various places now use the "create an element" hook introduced to the DOM Standard for creating elements:
  • document.title
  • table-created
  • insertRow()
  • insertCell()
  • Audio() constructor
  • Image() constructor
  • Option() constructor
• All throughout the spec: [CEReactions] extended attributes are now present

Also, here is a listing of all relevant commits:

• https://github.com/whatwg/html/commit/6e7eaa4bd2912965fd83766f99f984f249531f3a
• https://github.com/whatwg/html/commit/785863622acc5cc9faf1ff392ae17786ee7b3b80
• https://github.com/whatwg/html/commit/1d596a555d3c2f067ae643e447eaa88137b595ac
• https://github.com/whatwg/html/commit/db8899be5b0971a3c43b8a2ac926a5df1f5bc2b9
• https://github.com/whatwg/html/commit/fc927e65ceab229209f116866a76b1c618b9a1d4
• https://github.com/whatwg/html/commit/27aa7bc4fa6f168654a8c858f0773e611f679b39
• https://github.com/whatwg/html/commit/1fee4f56538b4881a43d75db7bf86fb634b370e0
• https://github.com/whatwg/html/commit/dee1771d9e3e0bd996521402988fba73372ee33e
• https://github.com/whatwg/html/commit/c9d898386d7b79cf1c7e104b5768e393c924078f
• https://github.com/whatwg/html/commit/a082daa4aa272f4eae77b67aa3116af482f03e5e
• https://github.com/whatwg/html/commit/28f252fbf714e18209cc1b747f5ee130a50ec649
• https://github.com/whatwg/html/commit/11bdd701e79c8dd6040586b5257eb01f3b620659

You may also be interested in similar information for changes to the DOM Standard.