[csswg-drafts] [css-values-4] Viewport Units clarifications (#7764)

bramus has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-values-4] Viewport Units clarifications ==
As part of the [Interop 2022 Viewport Investigation Effort](https://github.com/web-platform-tests/interop-2022-viewport/) we noticed there are some aspects not explicitly defined, leaving room for interpretation.

1. [How do Viewport-Percentage lengths behave on browsers with no dynamic UA UI Elements?](https://github.com/web-platform-tests/interop-2022-viewport/issues/12)
  In User Agents that have no dynamic UA toolbars, the Large+Small+Dynamic Viewport all have the same size. This is not explicitly mentioned, and could wrongfully be interpreted as “these User Agents have no dvh/lvh/svh units”.
  
1. [Is `100dvh` clamped between `100svh` and `100lvh`?](https://github.com/web-platform-tests/interop-2022-viewport/issues/14)
  In some browsers we noticed `100dvh` can grow larger than `100lvh` in very specific scenarios. This looks like a browser bug, but it would be good if the spec were backing this up here by explicitly mentioning that the value of `dvh` is clamped between `svh` and `lvh`.

Two minor remarks/clarifications in the spec could solve this.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/7764 using your GitHub account


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Received on Monday, 19 September 2022 13:58:50 UTC