0702fdd8610d6a05fe8965637ede2561c18cf25d  [line-clamp] line-clamp on a float or an absolutely positioned box is ignored

Classified as not security-relevant.
Triage note: LineClampUpdater changes CheckedPtr->CheckedRef (minor non-null hardening, not a fixed bug) and adjusts block-ellipsis/line-clamp counting logic (establishesIndependentFormattingContext() skip, maximumLines handling). This is rendering-layout correctness for CSS Overflow-4 line-clamp, no memory-safety or attacker-exploitable logic bug.
This commit was flagged by the signal scorer and reviewed by AI (not a human). It is listed only so the triage is auditable; there is no root-cause analysis because this is not a vulnerability fix.

Structural signals: smartptr_member_added (+3.0), null_guard (+1.95), msg_medium (+2.0), msg_soft (+1.0), msg_noise (-2.5), area:Source/WebCore/rendering (+2.0), surgical (+1.3)