Getting a full page screenshot?

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My site has a lot of long-form content, so most pages have a scrollbar. Trying to use the Capture method on the browser to get a screenshot works, but only for the visible frame. Is there a way to capture the entire contents of the page to a screenshot?

I was thinking about doing scrolls, but I can't seem to find a scroll / page height that I can use to calculate how far and how many times I need to scroll so I can stitch together an image. Is it possible to get such information?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.telerik.com/forums/getting-a-full-page-screenshot

Corporate Animation Video