Disallow unqualified attribute selectors

Rule from css under compatibility category

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Unqualified attribute selectors, such as [type=text], match all elements first and then check their attributes. This means they have the same performance characteristics as the universal selector (*). Similar to the universal selector, unqualified attribute selectors cause performance issues when used as the key part (far-right) of a selector.

/* BAD */
.mybox [type=text] {
    background: #fff;
    color: #000;
    background: rgba(255, 255, 255, 0.5);

How do I fix this ?

Don't make the unqualified attribute the key part of the selector, i.e. don't put it at the far right (which gets parsed first).

/* GOOD */
.selected [type=text] a {
    color: red;


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