Attribute name only (no value) CSS selector throws if html attribute has a value.

[m59peacemaker]

This is fine:

<button foo></button>

<style>
button[foo] {}
</style>

But this throws TypeError: operators[operator] is not a function:

<button foo="bar"></button>

<style>
button[foo] {}
</style>

REPL

Stack trace

TypeError: operators[operator] is not a function at attributeMatches (Selector.ts:228) at _loop_1 (Selector.ts:163) at applySelector (Selector.ts:141) at Selector.apply (Selector.ts:30) at Stylesheet.ts:23 at Array.forEach () at Rule.apply (Stylesheet.ts:23) at Stylesheet.apply (Stylesheet.ts:343) at Element (preprocess.ts:427) at preprocess.ts:482