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javascript - Load image from tag <img> to og:image content as a thumbnail

I am developing a bagde generator website. There will be user's name on the badge, so I use to merge the raw badge with the user's name. The raw badge is the background and the name will be wrote on it. Now I mean sharing the badge's link with thumbnail, but I want the content as the thumbnail image. How can I do that? Is that possible making the thumbnail dynamic every page loaded ?

Thanks.


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