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文章 · 前端 | 2个月前 | html

HTML中使用aria-required标注必填字段的方法如下：添加 aria-required="true" 属性在需要标记为必填的表单元素（如、或 <select>）上，添加 aria-required="true" 属性。<input type="text" name="username" aria-required="true" />结合 requi</a></div> <a href="/article/611976.html" class="img_box"><img src="/uploads/20260526/17797577716a14f2cb96459.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="HTML中使用aria-required标注必填字段的方法如下：添加 aria-required="true" 属性在需要标记为必填的表单元素（如 <input>、<textarea> 或 <select>）上，添加 aria-required="true" 属性。<input type="text" name="username" aria-required="true" />结合 requi"></a> <div class="cont lineFourOverflow">必须同时写required和aria-required="true"，前者触发浏览器原生校验、影响键盘类型及CSS伪类，后者确保屏幕阅读器正确播报；缺一则导致校验失效或无障碍支持缺失。</div> <div class="clear"></div> <div class="opt"> <div class="left"> <span><i class="view"></i>416</span> <span class="collectBtn user_collection" data-type="article" data-id="611976"><i class="collect"></i>收藏</span> </div> <div class="clear"></div> </div> </li> <li class="li2"> <div class="info lineOverflow"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2个月前 | </div> <div class="tit lineTwoOverflow"><a href="/article/611968.html" class="aBlack">多重阴影+absolute定位，打造层次感登录框</a></div> <a href="/article/611968.html" class="img_box"><img src="/uploads/20260526/17797574046a14f15cd6322.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="多重阴影+absolute定位，打造层次感登录框"></a> <div class="cont lineFourOverflow">position:absolute易使登录框“飘”出视口，因其默认相对于最近非static祖先定位；若父容器未设position:relative，则回退至视口定位，且top:50%;left:50%仅锚定左上角，不加transform:translate(-50%,-50%)会导致偏移。</div> <div class="clear"></div> <div class="opt"> <div class="left"> <span><i class="view"></i>444</span> <span class="collectBtn user_collection" data-type="article" data-id="611968"><i class="collect"></i>收藏</span> </div> <div class="clear"></div> </div> </li> <li class="li2"> <div class="info lineOverflow"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2个月前 | </div> <div class="tit lineTwoOverflow"><a href="/article/611967.html" class="aBlack">CSS实现响应式图片布局：max-width与height:auto技巧</a></div> <a href="/article/611967.html" class="img_box"><img src="/uploads/20260526/17797573946a14f152dbe12.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="CSS实现响应式图片布局：max-width与height:auto技巧"></a> <div class="cont lineFourOverflow">根本原因是未切断图片固有宽高比约束；解法是max-width:100%配height:auto保比例缩放，object-fit:cover填满不变形，srcset/sizes适配多分辨率，flex中需设align-self或min-height:0防塌陷。</div> <div class="clear"></div> <div class="opt"> <div class="left"> <span><i class="view"></i>253</span> <span class="collectBtn user_collection" data-type="article" data-id="611967"><i class="collect"></i>收藏</span> </div> <div class="clear"></div> </div> </li> <li class="li2"> <div class="info lineOverflow"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2个月前 | </div> <div class="tit lineTwoOverflow"><a href="/article/611966.html" class="aBlack">HTML5添加图片方法与技巧详解</a></div> <a href="/article/611966.html" class="img_box"><img src="/uploads/20260526/17797573396a14f11b3a906.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="HTML5添加图片方法与技巧详解"></a> <div class="cont lineFourOverflow">HTML5使用<img>标签嵌入图片，需设src和alt属性；支持srcset/sizes实现响应式；可用<figure><figcaption>增强语义；loading="lazy"实现懒加载；onerror处理图片缺失。</div> <div class="clear"></div> <div class="opt"> <div class="left"> <span><i class="view"></i>442</span> <span class="collectBtn user_collection" data-type="article" data-id="611966"><i class="collect"></i>收藏</span> </div> <div class="clear"></div> </div> </li> <li class="li2"> <div class="info lineOverflow"> <a href="/articlelist/19_new_0_1.html" 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href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2个月前 | </div> <div class="tit lineTwoOverflow"><a href="/article/611900.html" class="aBlack">HTML下拉框optgroup分组优化选择体验</a></div> <a href="/article/611900.html" class="img_box"><img src="/uploads/20260526/17797541696a14e4b9cb6ab.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="HTML下拉框optgroup分组优化选择体验"></a> <div class="cont lineFourOverflow"><optgroup>是唯一原生、语义正确且无障碍友好的下拉分组方式，但必须有非空label、直接嵌套于<select>内、禁用仅作用于选项而非标题，且不参与表单提交。</div> <div class="clear"></div> <div class="opt"> <div class="left"> <span><i class="view"></i>470</span> <span class="collectBtn user_collection" data-type="article" data-id="611900"><i class="collect"></i>收藏</span> </div> <div class="clear"></div> </div> </li> <li class="li2"> <div class="info lineOverflow"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a 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class="aLightGray" title="前端">前端</a> | 2个月前 | </div> <div class="tit lineTwoOverflow"><a href="/article/611893.html" class="aBlack">CSS实现弹窗居中显示的方法有多种，以下是几种常见的实现方式：1. 使用 Flexbox（推荐）Flexbox 是最简单且现代的布局方式，适用于大多数场景。/* 弹窗容器 */ .modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; display: flex; justify-cont</a></div> <a href="/article/611893.html" class="img_box"><img src="/uploads/20260526/17797538086a14e35044757.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="CSS实现弹窗居中显示的方法有多种，以下是几种常见的实现方式：1. 使用 Flexbox（推荐）Flexbox 是最简单且现代的布局方式，适用于大多数场景。/* 弹窗容器 */ .modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; display: flex; justify-cont"></a> <div class="cont lineFourOverflow">使用Flexbox或绝对定位+transform可实现弹窗居中。1.Flexbox：父容器设为flex，用justify-content和align-items居中，无需知悉子元素尺寸；2.绝对定位：元素top和left设50%，再用transform位移-50%实现精准居中。推荐使用Flexbox，更简洁现代，兼容性需求高时选绝对定位。</div> <div class="clear"></div> <div class="opt"> <div class="left"> <span><i class="view"></i>477</span> <span class="collectBtn user_collection" data-type="article" data-id="611893"><i class="collect"></i>收藏</span> </div> <div class="clear"></div> </div> </li> <li class="li2"> <div class="info lineOverflow"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2个月前 | </div> <div class="tit lineTwoOverflow"><a href="/article/611890.html" class="aBlack">ID选择器优先级高于类选择器，主要源于CSS的权重计算规则。在CSS中，选择器的优先级由其类型和具体写法决定，而ID选择器的权重高于类选择器，这使得在样式冲突时，ID选择器的样式会覆盖类选择器。1. CSS选择器权重计算规则CSS中的选择器有不同的权重值，这些值决定了在多个样式规则冲突时，哪个样式会被应用。权重值从低到高大致如下：*通用选择器（如 ``）**：权重为 0元素选择器（如 div）：权</a></div> <a href="/article/611890.html" class="img_box"><img src="/uploads/20260526/17797536316a14e29f415b9.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="ID选择器优先级高于类选择器，主要源于CSS的权重计算规则。在CSS中，选择器的优先级由其类型和具体写法决定，而ID选择器的权重高于类选择器，这使得在样式冲突时，ID选择器的样式会覆盖类选择器。1. CSS选择器权重计算规则CSS中的选择器有不同的权重值，这些值决定了在多个样式规则冲突时，哪个样式会被应用。权重值从低到高大致如下：*通用选择器（如 ``）**：权重为 0元素选择器（如 div）：权"></a> <div class="cont lineFourOverflow">ID选择器优先级高于类选择器，因CSS权重按四元组(内联,ID,类/伪类/属性,标签/伪元素)逐位比较，ID存在时第二位为1必胜；调试应查隐藏ID，避免滥用!important。</div> <div class="clear"></div> <div class="opt"> <div class="left"> <span><i class="view"></i>110</span> <span class="collectBtn user_collection" data-type="article" data-id="611890"><i class="collect"></i>收藏</span> </div> <div class="clear"></div> </div> </li> </ul> <div class="mngfPage"><a href="/articlelist/88_new_0_119.html" class="prevPage on"></a> <a href="/articlelist/88_new_0_1.html">1</a><a href="/articlelist/88_new_0_119.html">119</a><a class="currentPage">120</a><a href="/articlelist/88_new_0_121.html">121</a><a href="/articlelist/88_new_0_500.html">500</a> <a href="/articlelist/88_new_0_121.html" class="nextPage on"></a></div> </div> </div> <div class="footer"> <ul> <li ><a href="/" class="aLightGray"><em class="navIcon navIconHome"></em><span>首页</span></a></li> <li class="curr"><a href="/articlelist.html" class="aLightGray"><em class="navIcon navIconRead"></em><span>阅读</span></a></li> <li ><a href="/courselist.html" class="aLightGray"><em class="navIcon navIconCourse"></em><span>课程</span></a></li> <li ><a href="/ai.html" class="aLightGray"><em class="navIcon navIconAi"></em><span>AI助手</span></a></li> <li ><a href="/user.html" class="aLightGray"><em class="navIcon navIconUser"></em><span>我的</span></a></li> </ul> </div> <script src="/assets/js/frontend/common.js" defer></script> <script src="/assets/js/juejin-theme.js?v=20260613b" defer></script> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?e34c3e8ab31ba35d7e1c48ea8d77315f"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> <script> let flaga = 1; var category_id = 88; let strbiaoqian = ''; let zhankaihtml = ''; // let zhankaihtml = '<div class="zhankaiflag biaoqianone " style="display: inline-block;" onclick="zhankaiflagclick(this);">展开<i></i></div>'; let shouqihtml = ''; // let shouqihtml = '<div class="zhankaiflag biaoqianone zhankai" style="display: inline-block;" onclick="zhankaiflagclick(this);">收起<i></i></div>'; let allhtml = ''; let fumo = ''; $(".userInfo1 .biaoqianone").each(function(){ var href = $(this).attr('href'); var cat_id = $(this).data('id'); let cuc = '<a href="'+href+'" class="biaoqianone" style="display: inline-block;">'; if(category_id!==0&&category_id==cat_id){ cuc ='<a href="javascript:;" class="biaoqianone hover" style="display: inline-block;">'; } fumo = cuc; allhtml+=fumo+$(this).html()+'</a>'; strbiaoqian+=fumo+$(this).html()+'</a>'; // if(flaga<=8){ // } flaga++; }); strbiaoqian+=zhankaihtml; allhtml+=shouqihtml; $(".userInfo1").html(strbiaoqian); // function zhankaiflagclick(obj){ // if($(obj).html()=='展开<i></i>'){ // $(obj).html('收起<i></i>'); // $(obj).addClass('zhankai'); // $(".userInfo1").html(allhtml); // }else{ // $(obj).html("展开<i></i>"); // $(obj).removeClass('zhankai'); // $(".userInfo1").html(strbiaoqian); // } // } $('.timeLimitBox').click(function(){ $(this).toggleClass('hover') }) </script> </body> </html>