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DOM fc601be94e75

Change handling of is="" in element creation and cloning Part of fixing https://github.com/whatwg/html/issues/3402. This changes two things: * It fixes the cloning steps to consult the internal is value, instead of the is="" content attribute. * It removes the step from createElement()/createElementNS() that would insert an is="" attribute in the created element, as we've now decided that is="" is a way of communicating to the parser, and not a general-purpose indicator of customized built-in-ness. See also https://github.com/whatwg/html/pull/3444 for the other half of the fix. Tests:

Domenic Denicola

HTML e5dc6bf18f35

Update customized built-in elements is="" interaction This follows the DOM changes in https://github.com/whatwg/dom/pull/566, and is part of fixing https://github.com/whatwg/html/issues/3402. The normative changes are to the serialization algorithm, which now writes out the element's is value as its is="" attribute, if no actual is="" attribute is present. The rest of the changes are to introductory text about customized built-in elements. Tests:

Domenic Denicola