html5 canvas - page.evaluate not working but page.exeute_script showing results -

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i have been using phantomjs render canvas element on page using threejs. earlier building page myself, did not gave option of adding background image through system url. after started using localhost url, did not worked when used page.evaluate(); surprise when use ruby/watir browser selenium same operation using execute_script method, works. want know doing differenty implement in phantomjs script instead of having watir/selenium etc.

thanks in advance.


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