[css-text-3] Segment Break Transformation Rules and wbr

[frivoal]

The Segment Break Transformation Rules allow text like this:

aaaa​
bbbb

to be rendered as if it were

aaaa​bbbb

This is nice, but in other circumstances, using U+200B does the same thing as using <wbr>. Since this rule does not speak of <wbr>,

aaaa<wbr>
bbbb

would be rendered into

aaaa<wbr> bbbb

rather than

aaaa<wbr>bbbb

That seems unfortunate, as <wbr> is largely the same as U+200B except with the ability to be targeted by selectors.

[fantasai]

It's up to HTML to define WBR as equivalent to U+200B, not CSS. Closing as out-of-scope.

[frivoal]

Sure, but we could offer a hook for that: "U+200B, or constructs considered equivalent by the host language."

[fantasai]

I don't think one is necessary. HTML should define it to be exactly equivalent for rendering. If we make an exception here, we have to track everywhere we need to make an exception, including places where we don't call out U+200B explicitly but it's included in some category of things.