![]() ![]() ![]() Neither the parent document nor the iframe document has access to each other’s DOM, CSS styles, or JavaScript functions if they’re not from the same domain. Browsers keep the context of the iframe and its parent document totally separate by default. Of course, as with many web technologies, there is a right way and a wrong way to use iframes, so I’d like to go over how to securely embed other sites’ contents with iframes, and how to prevent others from attacking your site by embedding your content as an iframe.Įverywhere you look, you see embedded YouTube videos, tweets, like buttons, and of course, the Tinfoil Security badge.Īll of these things are embedded via iframes, or at least should be. In fact, they are the easiest and safest way to embed content from other sites into your page. ![]() Yet, iframes are still around, and every indication shows they’re here to stay. These days, with AJAX and WebSockets providing all the interactivity and partial page refresh behavior we could ever need (for now), framesets and frames have long become unnecessary and don’t even exist in HTML5. As a compromise, inline frames (iframes) were introduced as a way to embed frames in an HTML document just like any other element, without being forced to use a frameset. You had the choice of either building your HTML page out of frames or a single body tag-never both. These things called framesets and frames were used to split up a webpage into separate sub-documents-a menu bar frame, a side bar frame, a footer frame-that could each reload on its own so that pages wouldn’t have to be reloaded entirely with every click of a hyperlink. Every time I hear about them it reminds me of the good old days when websites were collections of static pages and internet speeds were measured in kilobits per second. ![]()
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