The for attribute is an allowed attribute for <label> and <output>. When used on a <label> element it indicates the form element that this label describes. When used on an <output> element it allows for an explicit relationship between the elements that represent values which are used in the output.
<p>
<label>First Name (no "for" attribute):</label>
<input id="first" type="text" value="Jane" />
</p>
<p>
<label for="last">Last Name (w/ "for" attribute):</label>
<input id="last" type="text" value="Doe" />
</p>
<p id="result">
<strong id="result-label">Full Name:</strong>
<output for="first last" aria-labelledby="result-label" id="output"></output>
</p>
label[for="paragraph"] {
color: rebeccapurple;
}
#result {
text-align: center;
}
#result-label {
font-size: 16pt;
}
#result-label,
#output {
display: block;
}
const firstNameEl = document.getElementById("first");
const lastNameEl = document.getElementById("last");
const outputEl = document.getElementById("output");
function updateOutput() {
const value = `${firstNameEl.value} ${lastNameEl.value}`;
outputEl.innerText = value;
}
updateOutput();
firstNameEl.addEventListener("input", updateOutput);
lastNameEl.addEventListener("input", updateOutput);
When used as an attribute of <label>, the for attribute has a value which is the id of the form element it relates to.
<label for="username">Your name</label> <input type="text" id="username" />
When used as an attribute of <output>, the for attribute has a value which is a space separated list of the id values of the elements which are used to create the output.
<input type="range" id="b" name="b" value="50" /> +
<input type="number" id="a" name="a" value="10" /> =
<output name="result" for="a b">60</output>
See examples of usage on the element pages for <label> and <output>.
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