In Chrome, select the Customize and Control menu button and select Settings.  |
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Select Show Advanced Settings at the bottom of the page.
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Select Content settings... under the Privacy heading.  |
Select the All cookies and site data... button.  |
In the search box, type g-wonlinetextbooks.  |
One or two instances should display. For all that display, select the item, then select para-zoomFactor.  |
Select Remove.  |
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Repeat for the second instance if necessary.
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Select Done twice to return to the settings menu.
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Close Chrome.
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Re-launch Chrome and access G-W Online Textbooks. The zoom feature should now work.
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