inline-style-null.html

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<!DOCTYPE html>

<style>

  div { color: green; }

  div#reverse { color: red; }

</style>

<div id="null" style="color: red">This text should be green</div>

<div id="emptystring"style="color: red">This text should be green</div>

<div id="reverse" style="color: green">This text should be green</div>

<script>

  document.getElementById("null").style.color = null;

  document.getElementById("emptystring").style.color = "";

  document.getElementById("reverse").style.color = "some invalid color string";

</script>