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This HTML Code gives the following error: document type does not allow element "input" here; missing one of "ins", "del", "h1", "h2", "h3", "h4", "h5", "h6", "p", "div", "address", "fieldset" start-tag <input type="button" name="submit" value="Login" onclick="login();" /> Regarding to W3C's own examples, an <input> tag are place within a <form> block. The source look like this: <form id="loginForm" action="#" method="post" style="margin: 0 auto; width: 50%"> <fieldset> <legend>Inloggning</legend> <p><label>User:</label><input type="text" name="username" /></p> <p><label>Password:</label><input type="password" name="password" onkeypress="CheckEnter()" /></p> </fieldset> <input type="button" name="submit" value="Login" onclick="login();" /> <input type="hidden" name="challenge" value="60e1c4c8e45f25ca4992a6ed2c5622f0795757aecb610fb3f03fe7fab39fcb10df3b47e101d0561a"/> </form>
Might be related to issue #12706
The <form> element allows only script and block level elements as children: http://www.w3.org/TR/html4/interact/forms.html#h-17.3 However, form controls, including <input> are inline level elements: http://www.w3.org/TR/html4/sgml/dtd.html#inline Thus, the last two <input> in the HTML code given are invalid.