[Webkit-unassigned] [Bug 6022] SVG Filters do not support source images besides "sourceGraphic" and "sourceAlpha"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=6022

--- Comment #9 from Andres Gomez Garcia <agomez at igalia.com> ---
Just adding a reference test, in case it is useful:
https://rawgit.com/tanty/design-hodgepodge/master/svg/filter/feBlend-backgroundimage-tests.html

Notice that for SVG 2 the "enable-background" is deprecated and the blending is governed by the isolation property:
http://dev.w3.org/fxtf/compositing-1/#isolation

Also, notice that, if I'm understanding correctly how the isolation property works, when using a SVG filter we shouldn't worry about what it is behind the SVG document since the filter makes a mandatory isolated group:
https://drafts.fxtf.org/compositing-1/#csscompositingrules_SVG

Similar issues from other web engines:
https://bugzilla.mozilla.org/show_bug.cgi?id=437554
https://code.google.com/p/chromium/issues/detail?id=137230
https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/10238658-implement-backgroundimage-backgroundalpha-input-so

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