Positive assert: the stacking context isolates blending :)
The issue with that is that it is more difficult to understand by someone that is not familiar enough with the spec.

From: mihaitica <notifications@github.com<mailto:notifications@github.com>>
Reply-To: w3c/csswg-test <reply@reply.github.com<mailto:reply@reply.github.com>>
Date: Thursday, January 23, 2014 at 12:00 PM
To: w3c/csswg-test <csswg-test@noreply.github.com<mailto:csswg-test@noreply.github.com>>
Cc: Horia Olaru <olaru@adobe.com<mailto:olaru@adobe.com>>
Subject: Re: [csswg-test] Rework section 4 of the mix-blend-mode test plan (#413)


In contributors/adobe/submitted/css-compositing/mix-blend-mode/mix-blend-mode-blended-element-with-transparent-pixels.html:

> -             <div class="parent">
> -                     <div class="blended">
> -                             <div class="childBlended"></div>
> -                     </div>
> -             </div>
> -     </body>
> -</html>
> +<!DOCTYPE html>
> +<html>
> +    <head>
> +        <title>CSS Test: blending between an element with transparent pixels and a child element</title>
> +        <link rel="author" title="Mirela Budăeș" href="mailto:mbudaes@adobe.com">
> +        <link rel="author" title="Mihai Tica" href="mailto:mitica@adobe.com">
> +        <link rel="reviewer" title="Mihai Balan" href="mailto:mibalan@adobe.com">
> +        <link rel="help" href="http://dev.w3.org/fxtf/compositing-1/#mix-blend-mode">
> +        <meta name="assert" content="Test checks that an element having mix-blend-mode and


It would better, in general, to have positive assertions: test checks that something happens, not that something doesn't.

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