add support for normative optional attribute #292
Merged
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cf tc39/ecma262#2215.
Most of the work here was tweaking the existing CSS so that the orange box wouldn't extend up into the whitespace preceding the clause.
The "normative optional" text is now selectable, and if the term "Normative Optional" is defined it will link to that definition.
Before (with ecma262's CSS):
After (with this PR's CSS):