Var iframe = document.createElement('iframe') You might have noticed that the iframe embed code generated by JSFiddle uses a src of “/ However, JSFiddle injects a top menu bar into all Iframes with a tab selector and “Edit in JSFiddle” text, regardless of how many tabs are set to display: The resulting Iframe can be set to just show the “result” of the fiddle, which is desirable if you are trying to show off a demo to users, rather than to other developers. You can easily configure it to generate an embeddable iframe: Inside the JSFiddle editor, there is an “Embed” button, which lets you configure an embedded widget that you can copy the code for and paste into your destination of choice. jsFiddle – An Interesting Lesson in Iframe Mitigation Embedding entire applications or exceeding what is considered “normal use” is likely against the TOS and is not a good idea anyway for anything beyond proof-of-concept demos and the such. However, please note that the intended purpose here is to embed code snippets to share with other developers or show off little demos. However, you might not know that many of these sites allow for direct embedding, and some even allow you to natively use iframes as the embed type. If you are a web developer that likes to share widgets, you are probably already familiar with sites like jsFiddle and CodePen. And of course this doesn’t help at all really with dynamic iframe generation, where you want to put user submitted content within iframes. However, if code relies on access to JS globals or things like, you might need to add some extra code to explicitly pass data from the parent window to the embed HTML file. This is always a good fall-back method to wrap anything in an iframe. I use this simple method a few times throughout this site, so that I can pull some custom widgets into a WordPress page and not have to worry about conflicting CSS or messing with HTML escaping in WordPress post content. Then to embed, you could simply pull it in via the standard iframe element. Lets pretend you uploaded it to the root of your domain, at /widget-A.html. I would be remiss if I didn’t mention the default way to host up an iframe that others can embed simply throw your code into a static HTML file (or generate with server-side code, more on that later), and shove the file onto your publicly accessible host (shared host, VPS, AWS bucket, etc).
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