Firefox 51 (today!) supports ::placeholder & :placeholder-shown to style <input placeholder> developer.mozilla.org/en-US/… developer.mozilla.org/en-US/…

::placeholder - CSS: Cascading Style Sheets | MDN

The ::placeholder CSS pseudo-element represents the placeholder text in an or element.

developer.mozilla.org
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:placeholder-shown is a pseudo-class matching inputs showing their placeholder ::placeholder is a pseudo-element matching the placeholder

Jan 24, 2017 · 9:52 PM UTC

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These are in Firefox 51, which shipped on release channel today. The pseudo-element was previously supported with a prefix.
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