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# Wk-notes-01-13-touchscreen-hover-and-apis

### iOS touch double tap issue

When there is a `hover` event, iOS would try to be smart to trigger the mouse enter event at the first touch/tap, and then trigger click event at the second touch/tap.

### Programmically media check

`window.matchMedia`

### Enzyme Pitfalls

`component.setState()` or `` `component.instance().setState() `` will change the component dom tree, but it does not update the snapshot right away. You need to call `component.update()` to keep the snapshot in sync.