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Diffstat (limited to 'testing/web-platform/tests/html/canvas/element/manual/context-attributes/drawImage_alpha_false.html')
| -rw-r--r-- | testing/web-platform/tests/html/canvas/element/manual/context-attributes/drawImage_alpha_false.html | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/element/manual/context-attributes/drawImage_alpha_false.html b/testing/web-platform/tests/html/canvas/element/manual/context-attributes/drawImage_alpha_false.html new file mode 100644 index 0000000000..64f38bceb1 --- /dev/null +++ b/testing/web-platform/tests/html/canvas/element/manual/context-attributes/drawImage_alpha_false.html @@ -0,0 +1,20 @@ +<!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> |