File: background-image-alpha-ref.html

package info (click to toggle)
thunderbird 1%3A140.3.1esr-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 4,608,628 kB
  • sloc: cpp: 7,671,698; javascript: 5,901,131; ansic: 3,898,955; python: 1,413,270; xml: 653,997; asm: 462,284; java: 180,948; sh: 113,489; makefile: 20,460; perl: 14,288; objc: 13,059; yacc: 4,583; pascal: 3,352; lex: 1,720; ruby: 1,222; exp: 762; sql: 715; awk: 580; php: 436; lisp: 430; sed: 70; csh: 10
file content (40 lines) | stat: -rw-r--r-- 763 bytes parent folder | download | duplicates (23) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
<!DOCTYPE html>
<html>
<head>
<style>
#background {
  background-color: yellow;
  display: inline-block;
}

.container {
  font-size: 0px;
}
</style>
</head>
<body>

<div id="background">
  <div class="container">
    <canvas id ="opaque" width="100" height="100"></canvas>
  </div>
  <div class="container">
    <canvas id ="nonopaque" width="100" height="100"></canvas>
  </div>
</div>

<script>
function drawCanvas(canvasID, hasAlpha) {
  var canvas = document.getElementById(canvasID);
  var context = canvas.getContext("2d", {alpha: hasAlpha});
  context.clearRect(0, 0, canvas.width, canvas.height);
  context.fillStyle = 'blue';
  context.fillRect(20, 20, 60, 60);
};

drawCanvas('opaque', false);
drawCanvas('nonopaque', true);

</script>
</body>
</html>