5 Focusable elements should fire focus event / receive :focus styling when they receive Narrator/accessibility focus
15 Implement the [`:dir()` pseudo-class](https://developer.mozilla.org/en-US/docs/Web/CSS/:dir) from Selectors Level 4
25 Implement [sticky positioning](http://html5please.com/#position:sticky) from CSS Positioned Layout Level 3
35 Implement the HTML5 [`<dialog>` element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog)
45 Fire a [`transitioncancel` event](https://developer.mozilla.org/en-US/docs/Web/Events/transitioncancel) when a CSS transition is canceled
55 Implement the [`of <selector-list>` clause](http://caniuse.com/#feat=css-nth-child-of) of the `:nth-child()` pseudo-class
65 Fire a [`transitioncancel` event](https://developer.mozilla.org/en-US/docs/Web/Events/transitioncancel) when a CSS transition is canceled
75 Implement the [`of <selector-list>` clause](http://caniuse.com/#feat=css-nth-child-of) of the `:nth-child()` pseudo-class
85 Implement the HTML5 [`<dialog>` element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog)
95 When virtual focus is on a button or link, fire actual focus on the element, too
105 Fire a [`transitioncancel` event](https://developer.mozilla.org/en-US/docs/Web/Events/transitioncancel) when a CSS transition is canceled
115 Implement the [`of <selector-list>` clause](http://caniuse.com/#feat=css-nth-child-of) of the `:nth-child()` pseudo-class
125 Implement the [`:dir()` pseudo-class](https://developer.mozilla.org/en-US/docs/Web/CSS/:dir) from Selectors Level 4
135 Fire a [`transitioncancel` event](https://developer.mozilla.org/en-US/docs/Web/Events/transitioncancel) when a CSS transition is canceled
145 Implement the [`:dir()` pseudo-class](https://developer.mozilla.org/en-US/docs/Web/CSS/:dir) from Selectors Level 4
155 Implement the HTML5 [`<dialog>` element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog)