Additional comparisons with alternatives

Continues from readme.md

Performance

	object-fit-images	tonipinel/object-fit-polyfill	jonathantneal/fitie
Size	1.6KB	1.9KB	1.5KB
Update wait	💚 No wait, applied before image load	💚 No wait, applied before image load	💔 Wait until full image load
Additional DOM elements necessary	💚 No	💔 Yes, a wrapping element is added	💔 Yes, a wrapping element is added
Performance overhead	💰	💰💰💰	💰💰
Technique description	Transparent `src` image; Image in `<img>`'s `background`	Wrapper element with style copied from `<img>`; CSS+JS positioning; Original `<img>` hidden	Wrapper element with style copied from `<img>`; JS positioning

	object-fit-images	tonipinel/object-fit-polyfill	jonathantneal/fitie
Object-fit definition	💛 In CSS, via `font-family` property *	💔 Via `data` attribute in HTML (`data-object-fit="cover"`)	💔 Via class in HTML (`class="cover"`)
Support changes in `@media` query	💚 Optional, with `{watchMQ:true}`	💔 No	💔 No
`onresize` listener	💚 Unnecessary, unless you use `scale-down`	💚 Unnecessary	💔 Yes, manually
Fix new elements automatically	💚 Optional, with `objectFitImages()` or `objectFitImages(false)`	💔 Impossible	💛 Manually
`<img>` `src` changes	💚 Automatically reflected	💔 Image not updated at all	💔 Fix not updated
Other limitations	💔 Any `onload` events on `<img>` will fire again when it fixes	💚 I didn't find any	💔 Some CSS declaration might be broken because partially moved to the wrapper

Runner-ups:

anselmh/object-fit is deprecated, doesn't support Edge and clocks in at 14KB.
@primozcigler/neat-trick requires jQuery and Modernizr, + more cons similar to the other two.