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<!DOCTYPE html> <html> <body> <h2>数字步骤 step</h2> <p>取决于浏览器支持：固定步骤 step 将应用于输入字段。</p> <form action="/action_page.php"> <label for="quantity">数量：</label> <input type="number" id="quantity" name="quantity" min="0" max="100" step="10" value="30"> <input type="submit" value="提交"> </form> </body> </html>