Fix/31305 date input empty placeholder#48675
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Track the empty state of date-like inputs (date, datetime-local, month, time, week) and apply an `inputEmptyDateLike` state class so the native `::-webkit-datetime-edit` placeholder is greyed out like a regular text placeholder instead of appearing filled. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Native date/time inputs (type="date", "datetime-local", "month", "time", "week") render their value — and, when empty, a placeholder — through the ::-webkit-datetime-edit pseudo-elements using the input's color. As a result an empty field looked identical to a filled one.
This tracks the empty state of date-like inputs and applies a new inputEmptyDateLike state class so the native placeholder is dimmed like a regular text placeholder, with a smooth opacity transition.
Closes #31305
Changes
InputBase: track empty state for date-like input types and expose an isEmptyDateLikeInput ownerState flag.
New inputEmptyDateLike state class dimming ::-webkit-datetime-edit for empty date/time inputs.
Added unit tests and a regression fixture (EmptyDateTextField).
Regenerated API docs and translations.
in collaboration with Claude Code