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40 lines
763 B
HTML
40 lines
763 B
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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#background {
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background-color: yellow;
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display: inline-block;
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}
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.container {
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font-size: 0px;
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}
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</style>
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</head>
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<body>
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<div id="background">
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<div class="container">
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<canvas id ="opaque" width="100" height="100"></canvas>
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</div>
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<div class="container">
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<canvas id ="nonopaque" width="100" height="100"></canvas>
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</div>
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</div>
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<script>
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function drawCanvas(canvasID, hasAlpha) {
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var canvas = document.getElementById(canvasID);
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var context = canvas.getContext("2d", {alpha: hasAlpha});
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context.clearRect(0, 0, canvas.width, canvas.height);
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context.fillStyle = 'blue';
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context.fillRect(20, 20, 60, 60);
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};
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drawCanvas('opaque', false);
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drawCanvas('nonopaque', true);
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</script>
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</body>
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</html>
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