<html>HTML |<textarea>占位符属性</html>

HTML 中的占位符属性</strong>用于指定在 textarea 元素中用户输入之前要显示的预期值。</p> <p><strong>句法：</strong> </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace"><textarea placeholder="text"></code></pre> </div> <p><strong>属性值：</strong>该属性包含单值<strong>文本</strong>，它是在用户输入之前显示的初始字符串。</p> <p><strong>示例 1：</strong>本示例使用 <textarea> 占位符属性来显示 textarea 占位符描述。 </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace"><!DOCTYPE html> <html> <head> <title> HTML Textarea placeholder Attribute </title> </head> <body style = "text-align:center"> <h1 style = "color: green;"> GeeksforGeeks </h1> <h2> HTML Textarea placeholder Attribute </h2> Description: <textarea placeholder ="Write some description here...">

输出：

示例 2：本示例使用占位符属性来显示 textarea 占位符描述。 </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace"><!DOCTYPE html> <html> <head> <title>HTML Textarea placeholder Attribute</title> <style> textarea::-webkit-input-placeholder { color: #0bf; } /* Firefox 18- */ textarea:-moz-placeholder { color: #0bf; } /* Firefox 19+ */ textarea::-moz-placeholder { color: #0bf; } textarea:-ms-input-placeholder { color: #0bf; } textarea::placeholder { color: green; } </style> </head> <body style = "text-align:center"> <h1 style = "color: green;"> GeeksforGeeks </h1> <h2> HTML Textarea placeholder Attribute </h2> <textarea placeholder="GeeksforGeeks is the computer" + " science portal for geeks.">