Re: [fxtf-drafts] [compositing] Question: in what color space will blending occur? (#427)

```html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS Test: hsla()</title>
  <link rel="author" title="L. David Baron" href="https://dbaron.org/" />
  <link rel="author" title="Chris Lilley" href="https://svgees.us" />
  <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
  <link rel="help" href="http://www.w3.org/TR/css3-color/#hsla-color" />
  <link rel="match" href="t425-hsla-basic-a-ref.xht" />
  <meta name="assert" content="Test basic functioning of hsla() colors." />
  <style type="text/css"><![CDATA[
  html, body { background: white; }
  div { width: 12em; height: 6em; }
  #one { background-color: hsla(120, 100%, 70%, 1.0); margin-bottom: 0 }
  #two { background-color: hsla(120, 100%, 50%, 0.6); margin-top:0 }
  ]]></style>
  /* 
  hsla(120, 100%, 70%, 1.0) is rgb(40% 100% 40%)
  hsla(120, 100%, 50%, 0.6) is rgb(0% 100% 0% / 0.6)
  composite rgb values at 60% over white  in sRGB = rgb(40% 100% 40%)
  BUT if compositing is done with used values, in device RGB 
  you will get a mismatch on WCG screen
  because the red and blue components will not be zero
  and the green will not be 100%
  */
 </head>
 <body>
  <p>Test passes if you see a light green square.</p>
  <div id="one"></div>
  <div id="two"></div>
 </body>
</html>
```

reference is

```html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS Test: hsla()</title>
  <link rel="author" title="L. David Baron" href="https://dbaron.org/" />
  <link rel="author" title="Chris Lilley" href="https://svgees.us" />
  <style type="text/css"><![CDATA[
  html, body { background: white; }
  div { width: 12em; height: 12em; }
  #one { background-color: hsla(120, 100%, 70%, 1.0); margin-bottom: 0 }
  ]]></style>
 </head>
 <body>
  <p>Test passes if you see a light green square.</p>
  <div id="one"></div>
 </body>
</html>
```

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Received on Friday, 27 October 2023 00:23:59 UTC