How to incorporate a leading zero in HTML input type number?

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You can use the "pattern" attribute in HTML input type number to incorporate leading zeros. Here's an example:

<label for="zipcode">Zip Code:</label>
<input type="number" id="zipcode" name="zipcode" pattern="[0-9]{5}" placeholder="00000">

In this example, the "pattern" attribute is set to "[0-9]{5}", which means the input should be a sequence of five digits. The "placeholder" attribute is set to "00000", which provides a visual cue to the user that they should enter five digits with leading zeros if necessary.

Note that using the "pattern" attribute does not guarantee that the input will have leading zeros, as some browsers may not enforce the pattern. Also, keep in mind that leading zeros may be significant or non-significant depending on what you're using the input for.