[resize-observer] svg interaction

[mozilla-apprentice]

A resolution was made for csswg-drafts/#4032.

[resize-observer] svg interaction

• RESOLVED: svg elements generating css layout boxes are included as part of resize observer and resize observer rectangles with a definition of `svg:root, *:not(svg&124;*) > svg, svg&124;foreignObject > svg { /* SVG elements with CSS layout box */}

Discussion.

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[emilio]

@heycam it looks like the bot needs to un-html-escape stuff :)

[mozilla-apprentice]

https://bugzilla.mozilla.org/show_bug.cgi?id=1565557