The History.length read-only property returns an integer representing the number of elements in the session history, including the currently loaded page. 
For example, for a page loaded in a new tab this property returns 1.
 The History.length read-only property returns an integer representing the number of elements in the session history, including the currently loaded page. 
For example, for a page loaded in a new tab this property returns 1.
A number.
| Specification | 
|---|
| HTML Standard  # dom-history-length-dev  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
length | 
1 | 12 | 1 | 10 | ≤12.1 | 1 | 4.4 | 18 | 4 | ≤12.1 | 1 | 1.0 | 
History interface it belongs to.
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    https://developer.mozilla.org/en-US/docs/Web/API/History/length