The value property of the Attr interface contains the value of the attribute.


A string representing the attribute value.


The following example displays the current value of the attribute test. Clicking on the button will change it to a different value, and read it again to update the displayed value.

HTML Content

<label test="initial value"></label>

<button>Click me to set test to <code>"a new value"</code></button>
Current value of the <code>test</code> attribute: <output id="result"><i>None.</i></output>

JavaScript Content

const elements = document.getElementsByTagName("label");
const buttons = document.getElementsByTagName("button");
const result  = document.querySelector("#result");

const attribute = elements[0].attributes[0];
result.value = attribute.value;

buttons[0].addEventListener('click',function(e) {
    attribute.value = "a new value";
    result.value = attribute.value;


DOM Standard
# dom-attr-value

Browser compatibility

BCD tables only load in the browser