dom-selection: add

dom-selection.md

@@ -0,0 +1,54 @@
+---
+title: DOM Selection
+category: JavaScript
+---
+
+## Selection
+See <http://devdocs.io/dom/selection>
+
+```js
+var selection = document.getSelection()
+```
+
+## Methods
+
+```js
+selection
+  .removeAllRanges()   // deselects
+  .addRange(range)     // sets a selection
+  .removeRange(range)  // remove a range
+```
+
+```js
+selection
+  .rangeCount          // ranges
+  .getRangeAt(0)       // get the 0th range
+```
+
+### Collapsing
+
+```js
+selection
+  .collapse(parent, offset)
+  .collapseToEnd()
+  .collapseToStart()
+  .isCollapsed
+```
+
+```js
+selection
+  .containsNode(node)
+```
+
+### Deleting
+
+```js
+selection
+  .deleteFromDocument()
+```
+
+### Events
+
+```js
+document.addEventListener('selectionchange', () => {})
+```