User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.97 Safari/537.22 Steps to reproduce: As with this question: http://stackoverflow.com/questions/12286367/how-do-i-style-html5-validation-errors-in-firefox I want to style the error message bubble that shows up when an <input> field is invalid. You can test with the <input>s on this page: http://www.the-art-of-web.com/html/html5-form-validation/ Actual results: I couldn't find any way of styling these messages in Firefox. Searching turned up: http://stackoverflow.com/questions/5328883/how-do-i-style-the-html-5-form-validation-error-messages-with-css http://stackoverflow.com/questions/5713405/how-do-you-style-the-html5-form-validation-messages Expected results: Firefox (Gecko) should provide some way to style this error message, like Chrome does: https://marakana.com/s/post/1336/styling_html5_form_validation_messages_with_css3
Thanks Robin! Do you think you could give a test case as simple as possible? Maybe using http://codepen.io or http://jsfiddle.net/ . And maybe a screenshot of how you are trying to make it look, also.
Webkit proposes something: http://trac.webkit.org/wiki/Styling%20Form%20Controls We could try to have something that looks like that (if it is technically possible to apply some content pseudo-elements on browser.xul content) but I don't feel I pressing need for it given that I doubt any other browser allow to style the error message and there is already a way for authors to implement their own visual by preventing default on the invalid message: http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#interactively-validate-the-constraints
There is an option to style the error message a lot: You can use the "x-moz-errormessage" attribute to choose your own error message.