# HTML DOM getAttribute() Method
## Definition and Usage
getAttribute() method returns the attribute value of the specified attribute name.
**Note:** If the element does not have the specified attribute, returns null or "".
## Syntax
```javascript
element.getAttribute(attributename)
```
## Parameters
| Parameter | Type | Description |
|---|---|---|
| attributename | String | Required. The attribute name whose value you need to get. |
## Return Value
| Type | Description |
|---|---|
| String | The attribute value, returns null if the attribute does not exist. |
## Browser Support
| Element |
|---|
| Yes | Yes | Yes | Yes | Yes |
## Technical Details
| DOM Version |
|---|
| Core Level 1 Element |
## More Examples
### Example 1
The following example returns the value of the 'class' attribute of the specified element:
```html
Get Attribute Value:
var x = document.getElementById("myImg").getAttribute("alt");
document.getElementById("demo").innerHTML = x;
```
### Example 2
The following example shows how to return the names of all attributes of an element:
```html
function myFunction() {
var x = document.getElementsByTagName("button");
var y = x.getAttributeNames();
var z = y.join(", ");
document.getElementById("demo").innerHTML = z;
}
```
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YouTip
var x = document.getElementById("myImg").getAttribute("alt");
document.getElementById("demo").innerHTML = x;
```
### Example 2
The following example shows how to return the names of all attributes of an element:
```html
function myFunction() {
var x = document.getElementsByTagName("button");
var y = x.getAttributeNames();
var z = y.join(", ");
document.getElementById("demo").innerHTML = z;
}
```
## Related Pages
HTML Tutorial: (
JavaScript Tutorial: (
* Is the above content helpful to you:
* * *
## Category Navigation
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* (http://www.miibeian.gov.cn/)