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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title></head><body> <!--<select> <option>下拉列表--> <form action="/demo/demo_form.asp"> <select name="cars" multiple> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="fiat">Fiat</option> <option value="audi">Audi</option> </select> <input list="browsers" name="browser"> <datalist id="browsers"> <option value="Internet Explorer"> <option value="Firefox"> <option value="Chrome"> <option value="Opera"> <option value="Safari"> </datalist> <input type="submit"> </form>
<!--<textarea>多行输入字段（文本域）--> <textarea name="message" rows="10" cols="30"> The cat was playing in the garden. </textarea>
<!--<button>按钮--> <input type="button" onclick="alert('Hello World!')" value="Click Me!">
<!--输入类型
color date datetime datetime-local email month number range search tel time url week-->
<!--只读属性 readonly--> <input type="text" name="firstname" value="Bill" readonly>
<!--禁用属性 disabled--> <input type="text" name="firstname" value="Bill" disabled>
<!--pattern 属性规定用于检查 <input> 元素值的正则表达式--> <input type="text" name="country_code" pattern="[A-Za-z]{3}" title="Three letter country code">
</body></html>
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