Sandboxed iframesThe sandbox attribute for the <iframe> HTML element sets many security restrictions on the iframe, such as preventing form submissions or opening modal dialogs. Optional allow- values relax specific restrictions.widely2015-07-292018-01-29https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-sandboxhttps://privacycg.github.io/storage-access/#sandboxing-storage-accessiframe-sandboxhttps://developer.mozilla.org/docs/Web/API/HTMLIFrameElement/sandboxapi.HTMLIFrameElement.sandboxhtml.elements.iframe.sandboxhtml.elements.iframe.sandbox.allow-downloadshtml.elements.iframe.sandbox.allow-formshtml.elements.iframe.sandbox.allow-modalshtml.elements.iframe.sandbox.allow-popupshtml.elements.iframe.sandbox.allow-popups-to-escape-sandboxhtml.elements.iframe.sandbox.allow-same-originhtml.elements.iframe.sandbox.allow-scriptshtml.elements.iframe.sandbox.allow-top-navigationhtml.elements.iframe.sandbox.allow-top-navigation-by-user-activationhtml.elements.iframe.sandbox.allow-top-navigation-to-custom-protocolshttps://nowyoucanuse.com/features--iframe-sandbox.html