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1 <!DOCTYPE html> | |
2 <html> | |
3 <head> | |
4 <style> | |
5 #background { | |
6 background-color: yellow; | |
7 display: inline-block; | |
8 } | |
9 | |
10 .container { | |
11 font-size: 0px; | |
12 } | |
13 </style> | |
14 </head> | |
15 <body> | |
16 | |
17 <div id="background"> | |
18 <div class="container"> | |
19 <canvas id ="opaque" width="100" height="100"></canvas> | |
20 </div> | |
21 <div class="container"> | |
22 <canvas id ="nonopaque" width="100" height="100"></canvas> | |
23 </div> | |
24 </div> | |
25 | |
26 <script> | |
27 function drawCanvas(canvasID, hasAlpha) { | |
28 var canvas = document.getElementById(canvasID); | |
29 var context = canvas.getContext("2d", {alpha: hasAlpha}); | |
30 context.clearRect(0, 0, canvas.width, canvas.height); | |
31 context.strokeStyle = 'blue'; | |
32 context.lineWidth = 4; | |
33 context.strokeRect(20, 20, 60, 60); | |
34 }; | |
35 | |
36 drawCanvas('opaque', false); | |
37 drawCanvas('nonopaque', true); | |
38 | |
39 </script> | |
40 </body> | |
41 </html> | |
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