什么是置换元素和非置换元素？

置换元素

置换元素是指：浏览器根据元素的标签和属性，来决定元素的具体显示内容。

例如：浏览器根据标签的src属性显示图片。根据标签的type属性决定显示输入框还是按钮。

置换元素在其显示中生成了框，这也就是有的内联元素能够设置宽高的原因。

html中的<select><object>都是置换元素，这些置换元素往往没有实际内容，即是一个空元素。</p> <br> <h4>非置换元素</h4> <p>浏览器中的大多数元素都是不可置换元素，即其内容直接展示给浏览器。</p> <p>例如<label>标签，<p>标签里的内容会被浏览器直接显示给用户。</p> </div>  <div class="p-2"></div> <div class="arcinfo my-3 fs-7 text-center"> <a href='/t/etagid49-0.html' class='tagbtn' target='_blank'>前端</a><a href='/t/etagid100-0.html' class='tagbtn' target='_blank'>CSS</a><a href='/t/etagid18626-0.html' class='tagbtn' target='_blank'>网站建设</a> </div> <div class="p-2"></div> </div> <div class="p-2"></div>  <div class="lbox p-4 shadow-sm rounded-3"> <div class="boxtitle"><h2 class="fs-4">相关</h2></div> <hr> <div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-565125.html">DOM修改使用DOM操作CSS</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-564641.html">Java web开发：从零到 Run 一个现有的 Spring Boot 前后端分离项目（前端Vue）</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-564642.html">HTML和CSS</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-564529.html">1.css布局技巧</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-564254.html">Scss支持多主题切换的方案实现</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-563647.html">google icons 的使用和 css 设置图标为 loading 状态</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-563694.html">nodejs 一个简单的web服务器，用于前端自己快速测试部署</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-563404.html">深入理解前端跨域方法和原理</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-562684.html">【前端单元测试入门04】Karma</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-560668.html">node-scss npm的时候报错</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-559591.html">前端MVC Vue2学习总结（六）——axios与跨域HTTP请求、Lodash工具库</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-559642.html">前端MVC Vue2学习总结（二）——Vue的实例、生命周期与Vue脚手架（vue-cli）</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div>   </div>  </div> <div class="col-lg-3 col-12 p-0 ps-lg-2">     <div class="lbox p-4 shadow-sm rounded-3"> <div class="boxtitle pb-2"><h2 class="fs-4"><a href="#">标签</a></h2></div> <div class="clearfix"></div> <ul class="m-0 p-0 fs-7 r-tag"> </ul> <div class="clearfix"></div> </div>  </div> </div> </div> </main> <div class="p-2"></div> <footer> <div class="container-fluid p-0 bg-black"> <div class="container p-0 fs-8"> <p class="text-center m-0 py-2 text-white-50">一品网 <a class="text-white-50" href="https://beian.miit.gov.cn/" target="_blank">冀ICP备14022925号-6</a></p> </div> </div> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?6e3dd49b5f14d985cc4c6bdb9248f52b"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </footer> <script src="/skin/bootstrap.bundle.js"></script> </body> </html>