[css-text] text-transform capitalize for words separated by periods only (no space) #8031
Description
Enter in the URL bar of a browser:
data:text/html,<!doctype html><div style="text-transform:capitalize">what.should.we.do</div>
Both Safari and Firefox returns:
What.should.we.do
While chrome returns:
What.Should.We.Do
The spec unfortunately seems to say that this is implementation dependent:
in https://drafts.csswg.org/css-text/#text-transform-mapping
For capitalize, what constitutes a “word“ is UA-dependent; [UAX29] is suggested (but not required) for determining such word boundaries. Out-of-flow elements and inline element boundaries must not introduce a text-transform word boundary and must be ignored when determining such word boundaries.
in https://www.unicode.org/reports/tr29/tr29-41.html
The goal of matching user perceptions cannot always be met exactly because the text alone does not always contain enough information to unambiguously decide boundaries. For example, the period (U+002E FULL STOP) is used ambiguously, sometimes for end-of-sentence purposes, sometimes for abbreviations, and sometimes for numbers. In most cases, however, programmatic text boundaries can match user perceptions quite closely, although sometimes the best that can be done is not to surprise the user.
There is an issue about this on https://bugs.chromium.org/p/chromium/issues/detail?id=1266835