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Editorial Team
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Asked: 2026-06-10T01:20:12+00:00

In a Chrome Extension, I’m trying to get gmail compose body content. An error

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In a Chrome Extension, I’m trying to get gmail compose body content.

An error jumps out sporadically, and does not prevents it from working.

This is being run as a content script. I believe permissions are not the issue here, because when there is a permission missing, the error is different and the operation is blocked by Chrome, definitely not the case.

Error comes out in this line:

encodeURIComponent($canvas.find('iframe').contents().find('body').text());

where 

var $canvas = $('#canvas_frame').contents();

Any information on this error and a possible turnaround?enter image description here

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1 Answer

  1. Editorial Team

    You can not read cross site content using javascript. XSS Auditor of Google Chorme will never allow this.

    Please have a look at http://en.wikipedia.org/wiki/Same_origin_policy

    UPDATE 1 –

    There is support for cross site communication using window.postMessage() in Chrome 2+. Please have a look at this documentation https://developer.mozilla.org/en-US/docs/DOM/window.postMessage

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