javascript - fillRect causes entire screen to change color -


i have webpage iframe in it, , within iframe there canvas id="canvas", when call (from .js file within iframe) fillrect on context of canvas entire web page (both inside , outside iframe turns grey. how prevent happening?

this javascript:

var canvas = document.getelementbyid('canvas') var ctx = canvas.getcontext('2d'); ctx.fillrect(0, 0, 100, 100);

this html within iframe:

<!doctype html> <html lang="en">   <head>     <meta charset="utf-8">     <link rel="stylesheet" href="main.css">   </head>   <body class="canvas">      <canvas id="canvas" width="600" height="400"></canvas>      <script src="game.js"></script>   </body> </html>

this css styling (which both iframe , webpage iframe use):

* {     -moz-box-sizing: border-box;     -webkit-box-sizing: border-box;     box-sizing: border-box;     margin: 0;     overflow: scroll;     padding: 0; } body {     background-color: #999999; /*this color entire screen turning*/ } canvas {     height: 400px;     overflow: hidden;     width: 600px; } canvas>canvas {     height: 100%;     width: 100%; }

i find annoying iframe can affect webpage in, main reason used iframe isolate , javascript related isolated rest of web page , seems not well. how fix bug , there way can isolate iframe not affect rest of webpage regardless of javascript put or @ least affects little possible.

edit: should mention if remove ctx.fillrect() works intended , web page doesn't turn grey.

edit2: should mention when turn grey, mean in foreground turned grey , covered on every other element on page (i have tags , various other things in main web page contains iframe, non-grey thing on screen in 100*100px black box, every piece of text / title / button etc. covered grey.

edit3: https://s3-us-west-2.amazonaws.com/dannys-aws/public/high+score+master+1.zip page in question if test yourself.

the issue overflow: auto; adding scroll bars every element.


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