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Editorial Team
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Asked: 2026-06-12T02:39:04+00:00

I am writing to an iframe via document.write then trying to overwrite the document

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I am writing to an iframe via document.write then trying to overwrite the document on that same iframe. In FF this works properly. However, in chrome code from the initial document.write persists even after I overwrite it with a second document.write.

See this fiddle: http://jsfiddle.net/meQcC/

If you view it in FF as one would expect, the iframe is blank and you actually get a “function onLoad is not defined error” because in the line 

doc.write("<html><head><script>;" +
      "<\/script></head><body onload='onLoad()'></body></html>");

There is obviously no onLoad function defined. However, if you view the same fiddle in chrome, the iframe will display a black rectangle, and there will be no error regarding the onLoad call, it will call the previously defined function as though it still exists!!!!

Is there any way to clear the document in chrome so that I can overwrite the contents of the iframe without old code somehow persisting? Is this a bug in chrome?

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1 Answer

  1. Editorial Team

    Yes, this is a bug in Chrome (or more precisely in WebKit). Per spec, it should be creating a new Window object and removing all global event listeners, and it’s not doing that.

    In particular, see http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#dom-document-open step 14.

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