html5 - .height/width of div returning different values into canvas -


above test website i'm trying out new html5 canvas tag. i've stripped down bit make relevant code easier locate.

the issue i'm having when setting width , height of canvas values i'm getting .height , .width methods larger div i'm trying them causing canvas overrun encapsulating div.

link jsbin:

http://jsbin.com/ejivux/13/edit

code incase people want in here:

html:

<!doctype html> <html>   <head>     <script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>     <meta charset=utf-8 />     <title>js bin</title>   </head>   <body>     <div id="container">       <div id="leftcolumn">          text        </div>        <div id="rightcolumn">        </div>      </div>   </body> </html>

css:

canvas{   border-width:5px;   border-style:solid; }  html{   height:99%;   background-color:red; }  body{   height:99%;   background-color:blue; }  #container{   background-color:yellow;   min-width:976px;   min-height:99%;   height:100%; }  #leftcolumn{   background-color:pink;   width:50%;   min-height:100%;   height:100;   float:left; }  #rightcolumn{   background-color:green;   width:50%;   min-height:100%;   height:100%;   float:left; }

js:

var canvasdiv = document.getelementbyid('rightcolumn'); canvas = document.createelement('canvas'); canvas.setattribute('width', $('#rightcolumn').width()); canvas.setattribute('height', $('#rightcolumn').height()); canvas.setattribute('id', 'canvas'); canvasdiv.appendchild(canvas);

your canvas has 5px border:

canvas{   border-width:5px;   border-style:solid; }

so if set width of canvas of containing div expect overall width of canvas 10px more div because of border on both sides. try this:

canvas.setattribute('width', $('#canvasdiv').width()-10); canvas.setattribute('height', $('#canvasdiv').height()-10);

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