[Webkit-unassigned] [Bug 212902] [SVG2] SVGUseElement spec contains breaking changes.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212902

--- Comment #2 from ian at ianbellomy.com ---
Ah, that report is certainly relevant. 

However, my specific concern is with the default appearance of the targeted element sans any styling of <use>.

In SVG1.1, absent a `use` rule, the re-presented circle element should always display per `.special circle{}`. (Given a `use` related rule, there is indeed ambiguity regarding which style rules take precedence and unexpected behavior may result, hence the bug report)

According to the SVG2 spec however, `.special circle{stroke:green}` should have no baring on the re-presented element, ever. That circle will technically be outside of `.special` and so those rule will not apply. 

Combined with the rules for shadowDOM (which underlies the SVG use element spec), in the test case, the re-presented circle will have neither a green stroke or purple stroke but no stroke at all — both instance styling and re-presentation are compromised. 

But while instance styling can be patched around via CSS variables, the ability to re-present an element whose appearance is determined by its source context will be eliminated entirely.

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