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Paste the code to your W3Schools Spaces website’s HTML field.
Next, go to your W3Schools Spaces website editor and find the HTML field. It is most likely in the form of an HTML/Code widget or module which you can find on the W3Schools Spaces’s editor. Add it to your page, and paste the Device Mockup Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Device Mockup widget on your W3Schools Spaces website.