You need to
before you can comment on or make changes to this bug.
Created an attachment (id=158661) [details]
-webkit-calc is not evaluating vh/vw units
related: https://bugs.webkit.org/show_bug.cgi?id=91554. It looks like the original implementor of the vw/vh units in WebKit is not coming back to fix these issues.
*** Bug 103774 has been marked as a duplicate of this bug. ***
The Chrome team has reportedly fixed this in Blink: