StaticRange.collapsed
 The collapsed read-only property of the StaticRange interface returns true if the range's start position and end position are the same. 
Syntax
var isCollapsed = staticRange.collapsed
Value
 A boolean value which is true if the range is collapsed. A collapsed range is one in which the start and end positions are the same, resulting in a zero-character-long range.. 
Specifications
| Specification | 
|---|
| DOM Standard (DOM) # ref-for-dom-range-collapsed①  | 
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
collapsed | 
60  | 
18  | 
69  | 
No  | 
47  | 
10.1  | 
60  | 
60  | 
No  | 
44  | 
10.3  | 
8.0  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/StaticRange/collapsed