1. CSS3 object-fit/object-position

    Method of specifying how an object (image or video) should fit inside its box. object-fit options include "contain" (fit according to aspect ratio), "fill" (stretches object to fill) and "cover" (overflows box but maintains ratio), where object-position allows the object to be repositioned like background-image does.

  2. mediatrackconstraints api: aspectratio

  3. mediatracksettings api: aspectratio

  4. mediatracksupportedconstraints api: aspectratio

  5. svganimatedpreserveaspectratio api

  6. svganimatedpreserveaspectratio api: animval

  7. svganimatedpreserveaspectratio api: baseval

  8. svgfeimageelement api: preserveaspectratio

  9. svgimageelement api: preserveaspectratio

  10. svgmarkerelement api: preserveaspectratio

  11. svgpreserveaspectratio api

  12. svgpreserveaspectratio api: align

  13. svgpreserveaspectratio api: meetorslice

  14. css at-rule: `@media`: `aspect-ratio` media feature

  15. css at-rule: `@media`: `device-aspect-ratio` media feature

  16. css property: aspect-ratio

  17. html element: embed: aspect ratio computed from `width` and `height` attributes

  18. html element: iframe: aspect ratio computed from `width` and `height` attributes

  19. html element: img: aspect ratio computed from `width` and `height` attributes

  20. html element: object: aspect ratio computed from `width` and `height` attributes

  21. html element: video: aspect ratio computed from `width` and `height` attributes

  22. svg element: svg: preserveaspectratio

  23. svg element: view: preserveaspectratio