[css-anchor-position] position-visibility initial value should be always, not anchors-visible ? · Issue #10425 · w3c/csswg-drafts (original) (raw)

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Description

When writing MDN docs for anchor positioning, I was a bit confused by position-visibility — the spec says "initial value" is anchors-visible, but surely it should be always?

From testing:

• If you don't set a position-visibility value, an anchor-positioned element is always visible provided it is inside the viewport, regardless of the visibility of its anchor. This is the behavior always gives as well.
• anchors-visible, on the other hand, causes an anchor-positioned element to be hidden if its anchor is not visible at all in the viewport.

My demo illustrates the behavior of the currently-supported values, in case that is helpful.