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<!DOCTYPE html> <html> <body> <h1>output form 属性</h1> <form action="/action_page.php" id="numform" oninput="x.value=parseInt(a.value)+parseInt(b.value)"> <input type="range" id="a" name="a" value="50"> + <input type="number" id="b" name="b" value="25"> <br><br> <input type="submit"> </form> <p>下面的输出元素在表单之外，但仍然是表单的一部分。</p> <output form="numform" id="x" name="x" for="a+b"></output> <p><strong>注意：</strong>任何主流浏览器都不支持 form 属性。</p> </body> </html>