remove requirement to support SVG requiredExtensions attribute per #1087

[dauwhe]

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[iherman]

I believe this change should be recorded in the changes' section.

[mattgarrish]

Fine with this change (except needs a change entry as already noted), but are authors still required to set the attribute or are we dropping that requirement, too?

[iherman]

Fine with this change (except needs a change entry as already noted), but are authors still required to set the attribute or are we dropping that requirement, too?

Looking up the original issues it seems that this attribute does more harm than good; my own tests resulted in SVG content that was not displayed (eg, on Thorium). So yes, I believe authors should forget about this.

[dauwhe]

I removed the corresponding line from the core spec, and added an entry to the change log.