1368113-1.html - mozsearch

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<!DOCTYPE html>

<style>

  input::placeholder { color: red; }

  input.green::placeholder { color: green; }

</style>

<input type="number" placeholder="This should be green">

<script>

  var i = document.querySelector("input");

  var s = getComputedStyle(i, "::placeholder");

  // Make sure we've computed the old color.

  var oldColor = s.color;

  i.className = "green";

</script>