How to Screenshot an Entire Webpage (including iframes)
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In Chrome, press Ctrl + Shift + I to open the developer menu
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Press the “Toggle Device Toolbar” button
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Set the screen size to something large (e.g. 7000 x 1000 for the family tree) and make sure the entire webpage is visible
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When you expand the image by increasing the pixel size, it moves down and to the right, so make sure the webpage is focused on the top left corner when you do this
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Press the “More Options” button and select “Capture Full Size Screenshot”
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To print, open in Paint Shop Pro, use page setup to format to fit across multiple pages, in Scaling: (i.e. 3 x 1 to print 3 pages wide)