gecko-dev/layout/reftests/text-shadow/basic-opacity-ref.html

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HTML

<div style="position: absolute; top: 33px; left: 33px; color: rgba(0, 0, 255, 0.2); z-index: 0;">Hello</div>
<div style="position: absolute; top: 30px; left: 30px; color: green; z-index: 1;">Hello</div>