Inline stylesheets in initial HTML

[Timer]

Instead of referencing a stylesheet via a <link> tag, we could inline its content in the initial HTML. This should result in a faster FCP. We need to do extensive measurement/testing before we'd consider doing this by default.

As an added bonus, this will help fix some browser-specific bugs (like Chrome incorrectly rendering a transition, #20540).

[xlkang]

Is there a specific time line for this issue?

[samcx]

Moving this to discussions since this is a feature request!