前言

工作中，经常会用到一些分割线，这些分割线平时一般都用div来模拟，记得当时ie浏览器hr标签样式修改经常有问题。随着时代的进步，技术的发展。目前hr标签可以大胆的使用在工作中了，且可以自定义出各种样式，当然，今天的hr样式你也可以同样用div实现，不过hr分割线更加语义化一点点。

渐变的

<hr class="hr_gradient1" />
.hr_gradient1 {
    border: 0;
    height: 1px;
    background: #333;
    background-image: linear-gradient(to right, #ccc, #333, #ccc);
}
<hr class="hr_gradient2" />
.hr_gradient2{
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0));
}

两边有修饰的

<hr class="hr-style-seven" />
.hr-style-seven {
    overflow: visible;
    height: 30px;
    border-style: solid;
    border-color: black;
    border-width: 1px 0 0 0;
    border-radius: 20px;
}
.hr-style-seven::before,
.hr-style-seven::after{
    display: block;
    content: "";
    height: 30px;
    margin-top: -31px;
    border-style: solid;
    border-color: black;
    border-width: 0 0 1px 0;
    border-radius: 20px;
}
<hr class="hr-space-square" />
 .hr-space-square {
    border: 0;
    color: #d0d0d5;
    background: linear-gradient(currentColor, currentColor) no-repeat center;
    background-size: calc(100% - 1.5em - 6px) 1px;
    display: flex;
    justify-content: space-between;
}
 .hr-space-square::before,
.hr-space-square::after {
    content: '';
    display: block;
    width: .75em; height: .75em;
    transform: rotate(45deg);
    box-sizing: border-box;
    border: 1px solid;
    margin: 3px;
}

复杂一点点的

<hr class="hr-double-arrow" />
.hr-double-arrow {
    color: #d0d0d5;
    border: double;
    border-width: 3px 5px;
    border-color: #d0d0d5 transparent;
    height: 1px;
    overflow: visible;
    margin-left: 20px;
    margin-right: 20px;
    position: relative;
}
.hr-double-arrow:before, 
.hr-double-arrow:after {
    content: '';
    position: absolute;
    width: 5px; height: 5px;
    border-width: 0 3px 3px 0;
    border-style: double;
    top: -3px;
    background: radial-gradient(2px at 1px 1px, currentColor 2px, transparent 0) no-repeat;
}
.hr-double-arrow:before {
    transform: rotate(-45deg);
    left: -20px;
}
.hr-double-arrow:after {
    transform: rotate(135deg);
    right: -20px;
}

通用中间文字的

<hr class="hr-solid-content" data-content="文字自适应，背景透明">
.hr-solid-content{
    color: #a2a9b6;
    border: 0;
    font-size: 12px;
    padding: 1em 0;
    position: relative;
}
.hr-solid-content::before {
    content: attr(data-content);
    position: absolute;
    padding: 0 1ch;
    line-height: 1px;
    border: solid #d0d0d5;
    border-width: 0 99vw;
    width: fit-content;
    /* for IE浏览器 */
    white-space: nowrap;
    left: 50%;
    transform: translateX(-50%);
}

文字带装饰

<hr class="hr-solid-content" data-content="分隔线">

css代码同上，多了以下部分

.hr-solid-content::after{
    content: attr(data-content);
    position: absolute;
    padding: 4px 1ch;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    color: transparent;
    border: 1px solid #d0d0d5;
}

波浪

<hr class="hr-wavy" />
.hr-wavy {
    border: 0;
    color: #d0d0d5;
    height: .5em;
    white-space: nowrap;
    letter-spacing: 100vw;
    padding-top: .5em;
}
.hr-wavy::before {
    content: "\2000\2000";
    /* IE浏览器实线代替 */
    text-decoration: overline;
    /* 现代浏览器 */
    text-decoration: overline wavy;
}

阴影

<hr class="hr-wavy" />
.hr-shadow {
    border: 0;
    padding-top: 10px;
    color: #d0d0d5;
    border-top: 1px solid rgba(0,0,0,.1);
    box-shadow: inset 0 10px 10px -10px;
}
<hr class="hr-twill" />
.hr-twill {
    border: 0;
    padding: 3px;
    background: repeating-linear-gradient(135deg, #a2a9b6 0px, #a2a9b6 1px, transparent 1px, transparent 6px);
}

疏密可以控制的虚线

<hr class="hr-dashed-fixed" style="--dashed-filled: 6px; --dashed-open: 5px;">
<hr class="hr-dashed-fixed" style="--dashed-filled: 12px; --dashed-open: 10px;">
.hr-dashed-fixed {
    border: 0;
    padding-top: 1px;
    /* for IE浏览器 */
    background: repeating-linear-gradient(to right, #a2a9b6 0px, #a2a9b6 4px, transparent 0px, transparent 10px);
    /* for 现代浏览器 */
    background: repeating-linear-gradient(to right, #a2a9b6 0 var(--dashed-filled, 4px), transparent 0 calc(var(--dashed-filled, 4px) + var(--dashed-open, 6px)));//传入变量来定义疏密
}

本文非原创，摘自网络。文中演示的hr标签为实际效果，非图片。