1. sandbox attribute for iframes

    Method of running external site pages with reduced privileges (e.g. no JavaScript) in iframes.

  2. 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.

  3. srcdoc attribute for iframes

    Override the content specified in the `src` attribute (if present) with HTML content within the attribute.

  4. 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.

  5. htmliframeelement api

  6. htmliframeelement api: align

  7. htmliframeelement api: allow

  8. htmliframeelement api: csp

  9. htmliframeelement api: name

  10. htmliframeelement api: src

  11. html element: iframe

  12. html element: iframe: align

  13. html element: iframe: allow

  14. html element: iframe: allowfullscreen

  15. html element: iframe: allowpaymentrequest

  16. html element: iframe: browsingtopics

  17. html element: iframe: credentialless

  18. html element: iframe: csp

  19. html element: iframe: external protocol urls blocked

  20. html element: iframe: frameborder

  21. html element: iframe: height

  22. html element: iframe: loading

  23. html element: iframe: longdesc

  24. html element: iframe: marginheight

  25. html element: iframe: marginwidth

  26. html element: iframe: name

  27. html element: iframe: referrerpolicy

  28. html element: iframe: referrerpolicy: no-referrer-when-downgrade

  29. html element: iframe: referrerpolicy: origin-when-cross-origin

  30. html element: iframe: referrerpolicy: unsafe-url

  31. html element: iframe: sandbox

  32. html element: iframe: sandbox: `sandbox="allow-downloads"`

  33. html element: iframe: sandbox: `sandbox="allow-downloads-without-user-activation"`

  34. html element: iframe: sandbox: `sandbox="allow-forms"`

  35. html element: iframe: sandbox: `sandbox="allow-modals"`

  36. html element: iframe: sandbox: `sandbox="allow-orientation-lock"`

  37. html element: iframe: sandbox: `sandbox="allow-pointer-lock"`

  38. html element: iframe: sandbox: `sandbox="allow-popups"`

  39. html element: iframe: sandbox: `sandbox="allow-popups-to-escape-sandbox"`

  40. html element: iframe: sandbox: `sandbox="allow-presentation"`

  41. html element: iframe: sandbox: `sandbox="allow-same-origin"`

  42. html element: iframe: sandbox: `sandbox="allow-scripts"`

  43. html element: iframe: sandbox: `sandbox="allow-storage-access-by-user-activation"`

  44. html element: iframe: sandbox: `sandbox="allow-top-navigation"`

  45. html element: iframe: sandbox: `sandbox="allow-top-navigation-by-user-activation"`

  46. html element: iframe: sandbox: `sandbox="allow-top-navigation-to-custom-protocols"`

  47. html element: iframe: scrolling

  48. html element: iframe: src

  49. html element: iframe: srcdoc

  50. html element: iframe: width