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<!DOCTYPE html>
<html>
<title>CSS Filters: feMergeNode with SourceAlpha</title>
<link rel="author" title="Fredrik Söderquist" href="mailto:fs@opera.com">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-1/#feMergeElement">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-1/#attr-valuedef-in-sourcealpha">
<link rel="help" href="https://crbug.com/109224">
<link rel="match" href="reference/effect-reference-source-alpha-001-ref.html">
<meta name="assert" content="Check that SourceAlpha is correctly derived from SourceGraphic which is the output of the opacity(0) filter function which essentially sets all pixels to transparent."/>
<style>
div {
position: absolute;
width: 100px;
height: 100px;
}
#test {
background-color: red;
filter: opacity(0) url(#f);
}
</style>
<div style="background-color: green"></div>
<div id="test">
<svg height="0">
<filter id="f">
<feMerge><feMergeNode in="SourceAlpha"></feMergeNode></feMerge>
</filter>
</svg>
</div>
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