I just found this, about how to embed HTML in a FB page. Anyone know if this is correct and up-to-date?
Although??pages have a uniform look and layout, it's possible to embed custom HTML code into your?Facebook?page for a customized feel. On?Facebook, the Static FBML?app?is Facebook's official and only way to customize a page with HTML. FBML (Facebook?Markup Language) is Facebook's own proprietary, modified version of HTML, and the?app?also allows HTML code. With the FBML?app, any user can use HTML to enhance your page.
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Log in to your??account. Go to your page where you want to embed HTML code.Click the "Edit Page" button in the top-right corner. On the next page, click "Apps" in the left menu.
Click "Browse more applications," located below the list of "Added?Apps" in the center. In the?App?search box in the left menu, type "FBML," and press "Enter."
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Select the "Static FBML"?app?from the list of results. On the?app?info page, click "Go to?App." The "Request for Permission" page subsequently appears.
Click "Allow." From the drop-down menu, select your page. Click "Done."
Go back to your??page. Click "Edit Page" on the top-right of the page. Click "Apps" in the left menu. In the list of "Added?Apps," the "Static FBML"?app?will appear.
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Click "Go to?App."
Enter your desired "Box Title" in the top box. This will be the title for the tab that appears for your FBML?app?in the left menu.
Enter your HTML code in the lower box entitled "FBML." Nearly all HTML tags are accepted here, so customize to your heart's content. Click "Save Changes" when complete.
Go back to your?Facebook?page. In the left menu, you'll notice a link with the same title you entered previously. Click this link. You have now embedded HTML on your?Facebook?page.
https://www.techwalla.com/articles/how-to-embed-html-on-facebook
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J
