如何在 HTML 中使用占位符属性？

我们知道placeholder属性用于定义必须在 input 和 textarea 字段中输入什么值的提示。此属性用于更好地理解表单结构。它包含一个字符串值，表示描述输入字段/文本区域的预期值的简短提示。在用户输入值之前，简短提示会显示在字段中。此属性用于更好地了解必须在特定字段中输入什么类型的数据。

它可以用在和元素中。</p><div class="textBasedMannualAds"></div><p><strong>句法：</strong> </p><div class="hcb_wrap"><pre class="prism undefined-numbers lang-html" data-lang="HTML"><code class="replace"><element placeholder=""></code></pre></div><p><strong>示例：</strong>下面的示例说明了占位符属性的使用。</p><div><h5 class="code">HTML</h5><div class="hcb_wrap"><pre class="prism undefined-numbers lang-html" data-lang="HTML"><code class="replace"><!DOCTYPE html> <html> <body> <center> <h1 style="font-size:25px; font-style:italic;"> GeeksforGeeks </h1> <h2 style="font-size:25px; font-family;Impact"> How to use placeholder attribute in HTML? </h2> <form action=" "> <input type="text" name="Ename" placeholder="Enter username or Email Address"> <br> <input type="Password" name="lname" placeholder="password"> <br> <input type="submit" value="Submit"> </form> </center> </body> </html></code></pre></div><br><hr></div><p><strong>输出：</strong> </p><p><img src="https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/How_to_use_placeholder_attribute_in_HTML_?_0.jpg" srcset="https://media.geeksforgeeks.org/wp-content/uploads/20210920231054/placeholderimg.png," sizes="100vw" width="641"></p><br><div id="GFG_AD_Desktop_InContent_ATF_728x280" style="margin-left:-3.5%;min-height:280px"></div><br></div></article> </div> </div> </div> </div> </div> <footer> <div class="bg-white text-center pb-1"> <p class="text-body-tertiary pt-3 lh-lg text-opacity-50" id="footer-text">Copyright © 2020 - 2024 版权所有 <br> <a href="https://beian.miit.gov.cn/" target="_blank" class="text-opacity-50 text-body-tertiary mt-1 mb-1">蜀ICP备20006366号-1</a> <br> Made with ❤️ in Chengdu </p> </div> </footer>  <script src="https://unpkg.com/bootstrap@5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" crossorigin="anonymous"></script>  <script src="https://cdn.jsdelivr.net/npm/@meilisearch/instant-meilisearch/dist/instant-meilisearch.umd.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/instantsearch.js@4"></script> <script src="https://www.imangodoc.com/static/javascript/meili_custom.js"></script>  <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/components/prism-core.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/plugins/toolbar/prism-toolbar.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/plugins/autoloader/prism-autoloader.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/plugins/copy-to-clipboard/prism-copy-to-clipboard.min.js"></script> </body> </html>