Why use an attribute selector to match classes?

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The [] syntax is an attribute selector.

a[class="btn"]

This will select any <a> tag with class="btn". However, it will not select <a> which has class="btn btn_red", for example (whereas a.btn would). It only exactly matches that attribute.

You may want to read The 30 CSS Selectors you Must Memorize. It’s invaluable to any up-and-coming web developer.

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