fill_alpha_false.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/manual/context-attributes/fill_alpha_false.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>CanvasRenderingContext 2D with alpha=flase, path fill with transparent color and 'copy' composite operation.</title>

<link rel="author" title="Justin Novosad" href="mailto:junov@chromium.org">

<link rel="help" href="https://html.spec.whatwg.org/#concept-canvas-alpha">

<link rel="match" href="fill_alpha_false-ref.html">

<meta name="assert" content="Canvas pixels remain opaque black when filling path with tranparent pixels and 'copy' compisite op.">

<p>Test passes if a 100x100 black square is displayed below.</p>

<canvas id="c" width=100 height=100></canvas>

<script>

const ctx = document.getElementById("c").getContext("2d", {alpha: false});

ctx.fillColor = 'red';

ctx.fillRect(25, 25, 50, 25); // will be overwritten.

ctx.fillColor = "rgba(0, 0, 0, 0.0)";

ctx.globalCompositeOperation = 'copy';

ctx.rect(25, 25, 50, 50);

ctx.fill();

</script>