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. requestAnimationFrame

    API allowing a more efficient way of running script-based animation, compared to traditional methods using timeouts. Also covers support for `cancelAnimationFrame`

  6. X-Frame-Options HTTP header

    An HTTP header which indicates whether the browser should allow the webpage to be displayed in a frame within another webpage. Used as a defense against clickjacking attacks.

  7. client api: frametype

  8. htmltableelement api: frame

  9. imagetrack api: framecount

  10. mediatrackconstraints api: framerate

  11. mediatracksettings api: framerate

  12. mediatracksupportedconstraints api: framerate

  13. ovr_multiview2 api: framebuffertexturemultiviewovr

  14. rtcstatsreport api: `inbound-rtp` stats: `frameheight` in 'inbound-rtp' stats

  15. rtcstatsreport api: `inbound-rtp` stats: `framesdecoded` in 'inbound-rtp' stats

  16. rtcstatsreport api: `inbound-rtp` stats: `framespersecond` in 'inbound-rtp' stats

  17. rtcstatsreport api: `inbound-rtp` stats: `framesreceived` in 'inbound-rtp' stats

  18. rtcstatsreport api: `inbound-rtp` stats: `framewidth` in 'inbound-rtp' stats

  19. rtcstatsreport api: `outbound-rtp` stats: `framessent` in 'outbound-rtp' stats

  20. rtcstatsreport api: `outbound-rtp` stats: `framewidth` in 'outbound-rtp' stats

  21. webgl2renderingcontext api: framebufferrenderbuffer

  22. webgl2renderingcontext api: framebuffertexture2d

  23. webgl2renderingcontext api: framebuffertexturelayer

  24. webglrenderingcontext api: framebufferrenderbuffer

  25. webglrenderingcontext api: framebuffertexture2d

  26. window api: frameelement

  27. window api: frames

  28. xrinputsourceevent api: frame

  29. xrwebgllayer api: framebuffer

  30. xrwebgllayer api: framebufferheight

  31. xrwebgllayer api: framebufferwidth

  32. html element: frame

  33. html element: frameset

  34. html element: frameset: cols

  35. html element: frameset: rows

  36. html element: frame: frameborder

  37. html element: frame: marginheight

  38. html element: frame: marginwidth

  39. html element: frame: name

  40. html element: frame: noresize

  41. html element: frame: scrolling

  42. html element: frame: src

  43. html element: table: frame

  44. headers http header: content-security-policy: frame-ancestors

  45. headers http header: content-security-policy: frame-src

  46. headers http header: x-frame-options

  47. headers http header: x-frame-options: allow-from

  48. headers http header: x-frame-options: sameorigin

  49. the vue.js framework

  50. the bootstrap framework