The spec for <length> and <percentage> units in initial-letter-wrap has this issue:
"ISSUE 25 These values and related annoyance is likely unnecessary if someone submits a patch to Blink to support 'first'."

Why is this tied to the completeness of the Blink implementation specifically?
Firefox doesn't have this property at all currently and I'm not sure about Safari, but it seems odd to tie the existence / removal of a feature to what happens to not (yet) be supported in a specific implementation.

I just feel like there's context missing here and it confuses me greatly.

The commit message for this also does not help at all.