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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>
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