v153 · scroll-axis-lock
Does this browser know the property?
A CSS property that a browser does not recognise is not an error — the declaration is simply dropped, and the page keeps working with the old behaviour. That makes "is it supported?" a question you have to ask deliberately, and answer with the property itself rather than a version number.
Every value, parsed
| value | parses? | computes to | note |
|---|
The invalid rows matter as much as the valid ones. A browser that accepted sideways would not be implementing this property — it would be ignoring the whole declaration, which parses as "accepted" to a careless check. Rejecting what the grammar does not list is the evidence that the grammar is implemented.
Try a value
The property applies to scroll containers, but computed style will happily report a value on anything — an inherited-style question, not a behavioural one. Switching the target shows that the computed value tells you nothing about whether the property will do anything.