UNCONFIRMED119219
script tag in document.write into an iframe triggers twice 
https://bugs.webkit.org/show_bug.cgi?id=119219
Summary script tag in document.write into an iframe triggers twice
harryledley
Reported 2013-07-29 08:15:38 PDT
If the content being written in a document.write into an iframe contains a script tag with a valid src in the head, it will trigger twice on a hard refresh. Example page: <html> <head> </head> <body> <img src='http://lakeshorepreserve.wisc.edu/photo-gallery/bigwoods/lg/Big%20Woods%20Aerial,%20Cronon,%20DSC_8790.jpg'> <script> var url="http://www.random.org/integers/?num=10&min=1&max=6&col=1&base=10&format=plain&rnd=new"; var jquery="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"; var iframe = document.createElement('iframe'); document.body.appendChild(iframe); var contents = '<!DOCTYPE html><html><head><title></title>\ <meta http-equiv="content-type" content="text/html; charset=UTF-8">\ <scr'+'ipt src="'+url+'"></scr'+'ipt>\ <scr'+'ipt src="'+jquery+'"></scr'+'ipt>\ </head></html>'; iframe.contentWindow.document.open('text/html', 'replace'); iframe.contentWindow.document.write(contents); iframe.contentWindow.document.close(); </script> </body> </html> The first script tag (random.org) should only fire once. Instead the first script tag fires twice. In Chrome they are both unique calls -- you can see this by looking at the response from each call. In safari the second call looks to load from cache as the numbers are the same. This seems to happen only when a document.write occurs before the window is loaded, hence the large image to delay the load event.
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