getHTML() and the serializable concept

[zcorpan]

Request for Mozilla Position on an Emerging Web Specification

• Specification title: getHTML() and the serializable concept
• Specification or proposal URL (if available): Add getHTML() and the serializable concept whatwg/html#10139
• Explainer URL (if available): Add getInnerHTML() that optionally serializes declarative Shadow DOM whatwg/html#8867
• Proposal author(s) (@-mention GitHub accounts): @mfreed7
• Caniuse.com URL (optional):
• Bugzilla URL (optional): https://bugzilla.mozilla.org/show_bug.cgi?id=1886630
• Mozillians who can provide input (optional): @zcorpan @hsivonen

Other information

From https://issues.chromium.org/issues/41492947

This work falls under these two chromestatus entries:
https://chromestatus.com/feature/5081733588582400
https://chromestatus.com/feature/5102952270528512
and these two blink-dev threads:
https://groups.google.com/a/chromium.org/g/blink-dev/c/PE4VwMjLVTo
https://groups.google.com/a/chromium.org/g/blink-dev/c/it0X7BOimKw

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This is being implemented in https://bugzilla.mozilla.org/show_bug.cgi?id=1890428