Refused to load because an ancestor violates the following content security policy directive: 'frame-ancestors 'self''. Or you may see an error like this when a frame ancestor url is not on the same origin (self), which would violate a frame-ancestors 'self' content security policy directive: Refused to load because it does not appear in the frame-ancestors directive of the content security policy. You might see an error message in the developer tools console such when you try to load a page in a frame, or iframe that is not allowed by the frame-ancestors policy, such as: What happens when frame-ancestors blocks something? No, the frame-ancestors does not inherit from the default-src directive, you need to explicitly specify it in your Content-Security-Policy header. Is frame-ancestors covered by the default-src directive? It must be specified as part of a Content-Security-Policy header. No, you cannot use the frame-ancestors directive from a Content-Security-Policy meta tag. Can frame-ancestors be used in a meta tag? In addition to frame and iframe the frame-ancestors directive also applies to applet, embed and objecttags. Now suppose we want to allow and to frame our page, we can specify it with frame-ancestors like this: frame-ancestors What HTML elements does frame-ancestors apply to? Using frame-ancestors 'self' is similar to using X-Frame-Options: sameorigin In this case you can use: frame-ancestors 'self'

Now suppose you want to allow a page to be framed, for example within an iframe, but only from the same site (same origin). Specifically this means that the given URI cannot be framed inside a frame or iframe tag.

Using frame-ancestors 'none' is similar to using X-Frame-Options: deny. The most common way to use the frame-ancestors directive is to block a page from being framed by other pages. Using the frame-ancestors CSP directive we can block or allow a page from being placed within a frame or iframe. You found a website with an excellent room builder, and so one your site, one of your pages you simply iframe that other content, so you now have a room builder on your website (and the other website isn't seen to the common observer).The frame-ancestors directive allows you to specify which parent URLs can frame the current resource. Let's say you are selling furniture on your website, and you want to put a room builder (where you can select the layout of furniture and color and so on). I would never use an iframe as an include.Īn example of where it is useful. It requires another HTTP request to wherever you are linking it to, and loads it into it's own special box with it's own properties. All the PHP code is completed and then the whole page is served back to the client as one pieceĪn iframe should almost solely be used to insert another website's content into your own. The PHP file actually takes the code at a server level and inserts it and executes any code that is within that file.

Php iframe example