The getElementsByName() method of the Document object returns a NodeList Collection of elements with a given name attribute in the document. 
 The getElementsByName() method of the Document object returns a NodeList Collection of elements with a given name attribute in the document. 
js
getElementsByName(name)
nameThe value of the name attribute of the element(s) we are looking for.
A live NodeList collection, meaning it automatically updates as new elements with the same name are added to, or removed from, the document.
html
<!doctype html> <html lang="en"> <head> <title>Example: using document.getElementsByName</title> </head> <body> <input type="hidden" name="up" /> <input type="hidden" name="down" /> </body> </html>
js
const up_names = document.getElementsByName("up"); console.log(up_names[0].tagName); // displays "INPUT"
 The name attribute can only be applied in (X)HTML documents. 
 The returned NodeList Collection contains all elements with the given name, such as <meta>, <object>, and even elements which do not support the name attribute at all. 
| Specification | 
|---|
| HTML Standard  # dom-document-getelementsbyname-dev  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
getElementsByName | 
1 | 12Before Edge 79, this method returns anHTMLCollection, not a NodeList. | 
1 | 5Returns anHTMLCollection, not a NodeList | 
5 | 1 | 4.4 | 18 | 4 | 10.1 | 1 | 1.0 | 
document.getElementById() to return a reference to an element by its unique id document.getElementsByTagName() to return references to elements with the same tag name document.querySelector() to return references to elements via CSS selectors like 'div.myclass' 
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    https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementsByName