sandbox attribute for iframes
Method of running external site pages with reduced privileges (e.g. no JavaScript) in iframes.
seamless attribute for iframes
The seamless attribute makes an iframe's contents actually part of a page, and adopts the styles from its hosting page. The attribute has been removed from both [the WHATWG](https://github.com/whatwg/html/issues/331) and [the W3C](https://github.com/w3c/html/pull/325) HTML5 specifications.
srcdoc attribute for iframes
Override the content specified in the `src` attribute (if present) with HTML content within the attribute.
Lazy loading via attribute for images & iframes
The `loading` attribute on images & iframes gives authors control over when the browser should start loading the resource.
htmliframeelement api
htmliframeelement api: align
htmliframeelement api: allow
htmliframeelement api: csp
htmliframeelement api: name
htmliframeelement api: src
htmliframeelement api: srcdoc
htmliframeelement api: width
html element: iframe
html element: iframe: align
html element: iframe: allow
html element: iframe: allowfullscreen
html element: iframe: allowpaymentrequest
html element: iframe: browsingtopics
html element: iframe: credentialless
html element: iframe: csp
html element: iframe: frameborder
html element: iframe: height
html element: iframe: loading
html element: iframe: longdesc
html element: iframe: marginheight
html element: iframe: marginwidth
html element: iframe: name
html element: iframe: referrerpolicy
html element: iframe: referrerpolicy: no-referrer-when-downgrade
html element: iframe: referrerpolicy: origin-when-cross-origin
html element: iframe: referrerpolicy: unsafe-url
html element: iframe: sandbox
html element: iframe: sandbox: `sandbox="allow-downloads"`
html element: iframe: sandbox: `sandbox="allow-forms"`
html element: iframe: sandbox: `sandbox="allow-modals"`
html element: iframe: sandbox: `sandbox="allow-orientation-lock"`
html element: iframe: sandbox: `sandbox="allow-pointer-lock"`
html element: iframe: sandbox: `sandbox="allow-popups"`
html element: iframe: sandbox: `sandbox="allow-popups-to-escape-sandbox"`
html element: iframe: sandbox: `sandbox="allow-presentation"`
html element: iframe: sandbox: `sandbox="allow-same-origin"`
html element: iframe: sandbox: `sandbox="allow-scripts"`
html element: iframe: sandbox: `sandbox="allow-storage-access-by-user-activation"`
html element: iframe: sandbox: `sandbox="allow-top-navigation"`
html element: iframe: sandbox: `sandbox="allow-top-navigation-by-user-activation"`
html element: iframe: sandbox: `sandbox="allow-top-navigation-to-custom-protocols"`
html element: iframe: scrolling
html element: iframe: src
html element: iframe: srcdoc
html element: iframe: width
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