<!DOCTYPE HTML>
<style>
</style>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

var css = null;

function boom2() {
    css.insertRule("#el1 { -webkit-animation: el1 2s linear; } ", css.rules.length);
    css.insertRule("@-webkit-keyframes el1 { from { -webkit-filter: saturate(0.9); } } ", css.rules.length);
    document.body.offsetTop;
    document.querySelector('style').appendChild(document.createTextNode("#el0 { -webkit-appearance:square-button } "));
    document.body.offsetTop;
}

function boom() {
    var xs=[
       "el0=document.createElement('navi'); el0.setAttribute('id','el0'); document.body.appendChild(el0);",
       "el1=document.createElement('canvas'); el1.setAttribute('id','el1'); document.body.appendChild(el1);",
       "el2=document.createElement('q'); ",
       "el3=document.createElement('footer'); ",
       "el4=document.createElement('dl'); ",
    ];
    for(var i=0; i<5; i++) { var xy=xs.shift(); eval(xy); document.body.offsetTop; };

    css.insertRule("#el4 { -webkit-mask-composite: 300 } ", css);
    css.insertRule("#el1 { -webkit-filter: saturate(0.1); } ", css.rules.length);
    document.body.offsetTop;
    css.insertRule("#el0 { -webkit-animation: el1 2s linear; } ", css.rules.length);
    css.insertRule("@-webkit-keyframes el1 { from { -webkit-filter: invert(0.6); } } ", css.rules.length);
    document.body.offsetTop;
    css.insertRule("#el2 { -webkit-animation: el1 2s linear; } ", css.rules.length);
    css.insertRule("@-webkit-keyframes el1 { from { -webkit-filter: invert(0.005); } } ", css.rules.length);
    css.insertRule(".c3:indeterminate { border:solidblack; } ", css.rules.length); 
    css.insertRule(".c4:out-of-range { -webkit-animation:anim1 10s linear 5s 3; } ", css.rules.length); 
    css.insertRule("#el3 { -webkit-transform-origin:middle  }", css.rules.length);

    setTimeout(boom2, 0);
}

onload = function() {
    css = document.styleSheets[0];
    setTimeout(boom, 0);
}
</script>
<!--
This test forces a situation where we reassign a Layer's grouped mapping,
but don't inform the old mapping of the change, and the old mapping attempts to
use the stale pointer.

FIXME: this test is gross and should be reduced to a minimal repro.
-->
<body>This test passes if it does not crash</body>