drawImage_alpha_false.html

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

<!DOCTYPE html>

<meta charset="utf-8">

<title>CanvasRenderingContext 2D with alpha=flase, drawing a transparent image</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="drawImage_alpha_false-ref.html">

<meta name="assert" content="Canvas pixels remain opaque black when drawing a transparent image.">

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

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

<script>

const source = document.createElement('canvas');

source.width = source.height = 20;

const source_ctx = source.getContext("2d"); // leave default transparent content

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

ctx.globalCompositOperation = 'copy';

ctx.drawImage(source, 0, 0);

ctx.globalCompositOperation = 'source-over';

ctx.drawImage(source, 20, 0);

</script>