Browsers block stylesheet loads if it is a cross-origin load where the MIME type is incorrect and the resource does not start with a valid CSS construct. Due to the relaxed syntax rules of CSS, cross-origin CSS requires a correct Content-Type header. Error details for syntax errors are only available for same-origin scripts. Here are some examples of resources which may be embedded cross-origin: For example, you can read the dimensions of an embedded image, the actions of an embedded script, or the availability of an embedded resource. Cross-origin reads are typically disallowed, but read access is often leaked by embedding.Cross-origin embedding is typically allowed.Examples are links, redirects, and form submissions. Cross-origin writes are typically allowed.These interactions are typically placed into three categories:
The same-origin policy controls interactions between two different origins, such as when you use XMLHttpRequest or an element. A more exhaustive list of failure cases can be found in Document.domain > Failures. localStorage, indexedDB, BroadcastChannel, SharedWorker).
For example, it will throw a " SecurityError" DOMException if the document-domain Permissions-Policy is enabled or the document is in a sandboxed, and changing the origin in this way does not affect the origin checks used by many Web APIs (e.g. It has to be set in both so their port numbers are both null. Therefore, one cannot make :8080 talk to by only setting document.domain = "" in the first. Any call to document.domain, including document.domain = document.domain, causes the port number to be overwritten with null. The port number is checked separately by the browser. However, could not set document.domain to, since that is not a superdomain of. Afterward, the page can pass the same-origin check with (assuming sets its document.domain to " " to indicate that it wishes to allow that - see document.domain for more).
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