為甚麼 Windows 高對比模式下 sprite 選取邊框會消失？

Disclosure: This draft was generated with AI and checked against the cited primary sources, with a separate AI editorial review. It was prepared for the FrameSprite team, which has a commercial interest in FrameSprite. Proposed examples are not executed tests unless explicitly identified as recorded fixture results.

Make sprite selection and focus survive the user's forced-colors mode. A shadow-only selection ring can disappear when the browser replaces author colors or suppresses shadows. Adapt the controls narrowly instead of disabling the user's display preference for the whole gallery.

Key Takeaways

• Use structural cues for selection and visible focus.
• Inspect controls in the actual forced-colors environment.
• Keep the artwork's presentation separate from control affordances.

A decorative shadow can carry essential state accidentally

The MDN forced-colors reference documents browser adjustments, including shadow handling. An interface that relies entirely on a glow can lose its only visible selection cue.

This does not imply every raster sprite is recolored by the browser. Inspect the actual elements and properties involved. The state indicator surrounding the image may fail while the image itself remains unchanged.

Distinguish selection from focus

Selection tells the reviewer which frame or action will be acted on. Focus identifies the current keyboard location. Both can matter at once. The W3C visible-focus guidance addresses the latter; it does not automatically implement selection.

Use a visible border, outline, text label, or other supported cue that remains perceivable. Avoid relying only on the difference between two custom background colors. Prefer native semantic controls when they fit the task.

Review the meaningful boundary against its actual adjacent colors with non-text contrast guidance. The relevant colors can differ from the normal theme after the user's preference is applied.

Example: the selected attack card

A card uses a teal box shadow when selected. Its plain border is intentionally transparent. In forced colors, the shadow no longer provides the expected cue, so the reviewer cannot tell whether Walk or Attack will be downloaded.

A proposed repair keeps a real border for the selected state and a separate visible focus treatment. A textual Selected label can reinforce the distinction. Test whether moving focus to the download button leaves the selected action understandable.

Do not broadly apply a forced-color opt-out to restore the original design. That can remove display adjustments the user relies on. If the artwork needs a controlled preview surface, isolate that requirement and retain the surrounding controls' support.

Acceptance with user preferences active

Run the review task using the supported operating-system and browser combination. Select a frame, move focus away, switch actions, and activate a control. Verify that both selection and focus are understandable rather than judging a static screenshot alone.

Record the environment and any targeted CSS adjustment. A normal dark theme is not the same test as a real forced-colors mode, and a screenshot with simulated recoloring does not establish equivalent behavior.

This is a proposed browser-interface check. No operating-system setting, CSS change, or keyboard task was executed for this article. It does not claim standards conformance from one visual cue or recommend changing the production sprite's palette to repair a review-control defect.

Related workflow

See game ui animation state screen reader feedback for the adjacent task. Carry the animation handoff checklist with the release, and use the art reference board to retain visual intent.

Prepared by the FrameSprite Workflow Team. Editorial method · Corrections. Primary documentation checked 2026-10-20.