8 var a
= document
.getElementById("a");
9 var b
= document
.getElementById("b");
10 a
.getContext('2d').createPattern(b
, 'no-repeat');
16 <body onload=
"boom();">
17 <canvas id=
"a" width=
"61" height=
"26"></canvas>
18 <canvas id=
"b" width=
"611" height=
"439807"></canvas>