HTML 中的 autofocus 属性用于指定元素在页面加载时应获得焦点。它是一个布尔属性。注意：它仅支持以下元素：、、 和 <br/><strong>支持的标签：</strong></p> <ul> <li> <strong><按钮></strong></li> <li> <strong><输入></strong></li> <li> <strong><keygen></strong></li> <li> <strong><选择></strong></li> <li> <strong><文本区域></strong></li> </ul> <p><strong>句法：</strong> </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace"><elementName autofocus></code></pre> </div> <p><strong>示例 1：</strong></p> <div> <h5 class="code">html</h5> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace"><!DOCTYPE html> <html> <head> <title>HTML autofocus Attribute</title> </head> <body style = "text-align: center;"> <h1 style = "color: green;">GeeksforGeeks</h1> <h2>HTML autofocus Attribute</h2> <form> <label>First Name: <input type="text" autofocus placeholder = "Enter Name"> </label> </form> </body> </html></code></pre> </div> <p></p> <hr/> <h5 class="code">html</h5> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace"><!DOCTYPE html> <html> <head> <title>HTML autofocus Attribute</title> </head> <body style = "text-align: center;"> <h1 style = "color: green;">GeeksforGeeks</h1> <h2>HTML autofocus Attribute</h2> <textarea rows="3" cols="30" autofocus> A computer science portal for geeks.