The Element.id property represents the element's identifier, reflecting the id global attribute.
It must be unique in a document, and is often used to retrieve the element using getElementById. Other common usages of id include using the element's ID as a selector when styling the document with CSS.
Note: identifiers are case-sensitive, but you should avoid creating IDs that differ only in the capitalization (see Case sensitivity in class and id names).
var idStr = elt.id; // Get the id. elt.id = idStr; // Set the id
idStr is the identifier of the element.| Specification | Status | Comment |
|---|---|---|
| DOM The definition of 'id' in that specification. | Living Standard | No change from Document Object Model (DOM) Level 2 HTML Specification. |
| Document Object Model (DOM) Level 2 HTML Specification The definition of 'id' in that specification. | Obsolete | No change from Document Object Model (DOM) Level 1 Specification. |
| Document Object Model (DOM) Level 1 Specification The definition of 'id' in that specification. | Obsolete | Initial definition. |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
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https://developer.mozilla.org/en-US/docs/Web/API/element/id