<!DOCTYPE html>
<style>
#ref1::-webkit-meter-bar { background: green }
#ref3::-webkit-meter-bar { background: blue }
</style>
<p>You should see a green, a default styled, and a blue meter below.</p>
<div><meter id="ref1"></meter></div>
<div><meter></meter></div>
<div><meter id="ref3"></meter></div>