See for tests https://wpt.fyi/results/css/css-initial-letter?label=master&label=experimental&aligned&view=subtest&q=initial-letter Spec https://www.w3.org/TR/css-inline/#sizing-drop-initials Applies to: certain inline-level boxes and ::first-letter and inside ::marker boxes (see prose) raise Computes to an initial letter sink of 1. drop Computes to an initial letter sink equal to the initial letter size floored to the nearest positive whole number. If the initial letter sink value is omitted, drop is assumed. Blink https://groups.google.com/a/chromium.org/g/blink-reviews-style/c/jHLdqhphZ3M https://chromium-review.googlesource.com/c/chromium/src/+/3874383 (the current patch doesn't include raise and drop) Gecko doesn't implement yet raise and drop https://bugzilla.mozilla.org/show_bug.cgi?id=1223880 CSSWG discussion https://github.com/w3c/csswg-drafts/issues/2955
<rdar://problem/101529501>
Blink attempts to ship CSS `initial-letter` applies only `::first-letter`. The patch[1] implements: * `initial-letter: number integer` * `initial-letter: number drop` * `initial-letter: number raise` * `initial-letter: drop number` * `initial-letter: raise number` * `initial-letter: number` [1] https://chromium-review.googlesource.com/c/chromium/src/+/3981353