Custom Element Selector

Issue

Is there a way to select all custom elements with CSS? I want to make all custom elements block elements by default (most browsers make them inline by default), and then override this as necessary.

My rule may look something like this:

*::custom {
    display: block;
}

All custom elements have dashes in the standard, so I could create a rule taking advantage of that, but it would be slower on many/most current browsers, as it would need to use regular expressions. If there were a built-in selector, this would probably be faster.

Solution

No, there isn't a pseudo selector to do that.

One certainly not optimal solution, however, would be to use this type of CSS:

:not(html, head, body, h1, h2, h3, h4, h5, h6, div, ...) {
  /* Code here */
}

It would work! On the down side if ever new elements are added you need to add that element into your not-selector. Yay.

^.^

Answered By - Florrie