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- <input type="text" name="username" pattern="[a-z]{1,15}" title="Username should only contain lowercase letters. e.g. john">
- <input type="text" name="username" pattern="[a-z]{1,15}" id="username">
- var input = document.getElementById('username');
- input.oninvalid = function(event) {
- event.target.setCustomValidity('Username should only contain lowercase
- letters. e.g. john');
- }
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