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     onload="init()">

<script type="application/ecmascript">
if (window.testRunner)
    testRunner.dumpAsText();
    
function init() {
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      cell.setAttributeNS(null, 'visibility','display');
  
}
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<text x="10" y="10" > PASS -- not crashing,  https://bugs.webkit.org/show_bug.cgi?id=27693 </text>
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