Docs, restored loadSprite and supported static methods

readme.md

@@ -73,7 +73,7 @@ Plyr extends upon the standard HTML5 markup so that's all you need for those typ
 #### HTML5 Video
 
 ```html
-<video poster="/path/to/poster.jpg" id="player" controls>
+<video poster="/path/to/poster.jpg" id="player" playsinline controls>
     <source src="/path/to/video.mp4" type="video/mp4">
     <source src="/path/to/video.webm" type="video/webm">
 
@@ -586,6 +586,22 @@ Plyr supports the last 2 versions of most _modern_ browsers. IE11 is also suppor
 2. Native player used (no support for `<progress>` or `<input type="range">`) but the API is supported (v1.0.28+)
 3. IE10 has no native fullscreen support, fallback can be used (see [options](#options))
 
+### Checking for support
+
+You can use the static method to check for support. For example
+
+```javascript
+const supported = Plyr.supported('video', 'html5', true);
+```
+
+The arguments are:
+
+* Media type (`audio` or `video`)
+* Provider (`html5`, `youtube` or `vimeo`)
+* Whether the player has the `playsinline` attribute (only applicable to iOS 10+)
+
+### Disable support programatically
+
 The `enabled` option can be used to disable certain User Agents. For example, if you don't want to use Plyr for smartphones, you could use:
 
 ```javascript