🤢 Behold! The most broken #CSS that still sort of works!
I wondered why CSS.supports("filter", "blur(") returned true. Well, it turns out that a standard-conforming CSS parser does not distinguish between } and EOF or between ) and EOF. And filter function arguments are all optional. So ending the stylesheet with "blur(" has the same effect as "blur(0px)" with all braces properly closed.
The whole story: @sir_pepe@mastodon.social
In Action: https://codepen.io/SirPepe/pen/ByLBGrJ?editors=0100
CSS is awesome.