The size attribute defines the width of the <input> and the height of the <select> element. For an input element, it defines the number of characters that the user agent allows the user to see when editing the value. For a select element, it defines the number of options that should be shown to the user. This must be a valid non-negative integer greater than zero.
If no size is specified, or an invalid value is specified, the input has no size declared, and the form control will be the default width based on the user agent. If CSS targets the element with properties impacting the width, CSS takes precedence.
The size attribute has no impact on constraint validation.
<label for="firstName">First Name:</label>
<input id="firstName" name="firstName" type="text" size="10" />
<label for="lastName">Last Name:</label>
<input id="lastName" name="lastName" type="text" size="20" />
<label for="fruit">Favorite fruit:</label>
<select id="fruit" name="fruit" size="2">
<option>Orange</option>
<option>Banana</option>
<option>Apple</option>
</select>
label {
display: block;
margin-top: 1rem;
}
By adding size on some input types, the width of the input can be controlled. Adding size on a select changes the height, defining how many options are visible in the closed state.
<label for="fruit">Enter a fruit</label>
<input type="text" size="15" id="fruit" />
<label for="vegetable">Enter a vegetable</label>
<input type="text" id="vegetable" />
<select name="fruits" size="5">
<option>banana</option>
<option>cherry</option>
<option>strawberry</option>
<option>durian</option>
<option>blueberry</option>
</select>
<select name="vegetables" size="5">
<option>carrot</option>
<option>cucumber</option>
<option>cauliflower</option>
<option>celery</option>
<option>collard greens</option>
</select>
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