css.properties.background-blend-mode - Missing SVG support in Firefox

What information was incorrect, unhelpful, or incomplete?

The documentation suggests that this feature should work with HTML and SVG (SVG is mentioned in the section "Applies to"). The section "Browser compatibility" shows "full support" for Firefox, but Firefox offers no support for this property in SVG.

What did you expect to see?

I would expect something like "partial support" in the compatibility table, and maybe also an explanation that clarifies that it does not work for SVG there.

Did you test this? If so, how?

This is a known Bug in Firefox, see https://bugzilla.mozilla.org/show_bug.cgi?id=1448257 (The link says it's a regeession, so maybe it did work from Firefox 30 to 55, but I don't think that's relevant today.)

I checked that it's still broken on:

• MacOS in Firefox 96.0.2
• Android in Firefox 96.3.0
• Ubuntu with a recent Firefox version (on a friend's machine, don't know the exact version)

Start with the css.properties.background-blend-mode query and compare its MDN page with the Firefox Bugzilla report linked in the issue. Update the browser compatibility data so Firefox's SVG limitation is accurately represented, including any needed explanatory detail, then verify the MDN compatibility table reflects the change.