https://mediawiki.org/wiki/Compatibility#Browser_support_matrix
**Summary**
This proposal is to restate Grade C browser support except Edge and Android to last 7 years' versions. Edge will be unaffected and remain at 79. Android is also unaffected, as the last version of Chrome WebView for Android 5 is 95.
**Differences**
Before
* Chrome: 49
* Firefox: 49
* Edge: 79
* Safari (macOS, iOS): 10
* Android: 5 (Chrome WebView 49)
After
* Chrome: 62 [previous 7 years' versions]
* Firefox: 57 [previous 7 years' versions]
* Edge: 79 (first Chromium version of Edge, 2020)
* Safari (macOS, iOS): 11 [previous 7 years' versions]
* Android: 5 (Chrome WebView 62 [previous 7 years' versions])
**Statistics**
[[https://caniuse.com/usage-table | CanIUse]]
* Chrome 49: 0.02%
* Chrome 50: 0.01%
* Chrome 53: 0.01%
* Chrome 56: 0.02%
* Firefox 52: 0.04%
* Firefox 56: 0.01%
* Safari iOS 10.2: 0.01%
* Safari iOS 10.3: 0.04%
Negligible amounts: Chrome 51, 52, 54, 55, 57-61, Firefox 49-51, 53-55, Safari macOS 10.x.
Total Chrome 49-61, Firefox 49-56 and Safari 10.x: 0.16%
**[[https://caniuse.com/?compare=chrome+49,chrome+62,safari+10,safari+11,firefox+49,firefox+57&compareCats=all | HTML/CSS additions]]**
Unprefixed
* CSS writing-mode property
* CSS :any-link selector (-moz- no longer needed, -webkit- still needed)
* CSS Filter Effects
* Intrinsic & Extrinsic Sizing (partial, only -webkit- unprefixed only, -moz- still needed)
* CSS3 Multiple column layout (partial)
Full support
* :placeholder-shown CSS pseudo-class (unprefixed)
* CSS text-orientation (-webkit- prefix for Safari)
* ::placeholder CSS pseudo-element (unprefixed)
* CSS background-blend-mode
* Pattern attribute for input fields
* Form validation
* HTTP/2 protocol
* :indeterminate CSS pseudo-class
* CSS3 Border images
* CSS.supports() API
* :default CSS pseudo-class
* :in-range and :out-of-range CSS pseudo-classes
* focusin & focusout events
* CSS font-stretch
* Download attribute
* Subresource Integrity
* Fetch
* Upgrade Insecure Requests
* CSS font-variant-numeric
* #rrggbbaa hex color notation
* Animated PNG (APNG)
* Minimum length attribute for input fields
* rel=noopener
* SPDY protocol
* "once" event listener option
* KeyboardEvent.key
* CSS justify-content: space-evenly
* CSS Grid Layout (level 1)
* :focus-within CSS pseudo-class
Partial support
* Resource Timing (basic support)
* Opus audio format
* relList (DOMTokenList)
* Scroll methods on elements (scroll, scrollTo, scrollBy)
* system-ui value for font-family
* FLAC audio format