The head read-only property of the Document interface returns the <head> element of the current document. 
 The head read-only property of the Document interface returns the <head> element of the current document. 
An HTMLHeadElement.
html
<!doctype html> <head id="my-document-head"> <title>Example: using document.head</title> </head> <script> const theHead = document.head; console.log(theHead.id); // "my-document-head"; console.log(theHead === document.querySelector("head")); // true </script>
 document.head is read-only. Trying to assign a value to this property will fail silently or, in Strict Mode, throws a TypeError . 
| Specification | 
|---|
| HTML Standard  # dom-document-head-dev  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
head | 
4 | 12 | 4 | 9 | 11 | 5 | ≤37 | 18 | 4 | 11 | 4 | 1.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/Document/head