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conformance · v153
v153 · single-axis-scroll-containers — conformance probe
7 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.
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pass
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fail
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blocked
7
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| id | contract | kind | verdict | detail |
|---|---|---|---|---|
overflow-accepts-two-values |
The two-value overflow shorthand is the syntax this feature extends; without it there is no pair to talk about. spec ↗ | css-supports | … | |
clip-alone-is-not-a-scrollport |
The reference behaviour: overflow:clip on both axes produces an element that clips without scrolling, proved by assigning a scroll offset and reading back zero. spec ↗ | script | … | |
hidden-is-a-scrollport |
The fact that makes this feature necessary: overflow:hidden is scrollable, it just has no scrollbar. An axis coerced from clip to hidden therefore still carries a scroll offset. spec ↗ | script | … | |
visible-is-coerced-beside-a-scrollable-value |
The long-standing coercion that clip's used to mirror: visible next to a scrollable value computes to auto. It is asserted here so the demos can present the clip rule as a change to one half of a symmetric pair rather than a new invention. spec ↗ | script | … | |
clip-survives-beside-a-scrollable-value |
The feature itself: with overflow:scroll clip, the block axis computes to clip rather than being coerced to hidden. spec ↗ | script | … | |
the-clipped-axis-stops-scrolling |
Computed style is not the point on its own — the consequence is. With overflow:scroll clip the inline axis must still take a scroll offset and the block axis must refuse one, which is what stops a focused element from displacing content on an axis with no scrollbar. spec ↗ | script | … | |
longhands-agree-with-the-shorthand |
overflow-x:scroll with overflow-y:clip must compute exactly as the shorthand does. A coercion that applied to one spelling and not the other would be a trap, and the demos measure both spellings because of it. spec ↗ | script | … |