h6 {
    font: 14px sans-serif;
    margin-top: 20px;
    text-align: center;
    text-transform: uppercase;
    font-weight: 900;
}

    h6.background {
        position: relative;
        z-index: 1;
        margin-top: 0%;
        width:85%;
        margin-left:6%;
    }

        h6.background span {
            background: #fff;
            padding: 0 15px;
        }

        h6.background:before {
            border-top: 2px solid #dfdfdf;
            content: "";
            margin: 0 auto; /* this centers the line to the full width specified */
            position: absolute; /* positioning must be absolute here, and relative positioning must be applied to the parent */
            top: 50%;
            left: 0;
            right: 0;
            bottom: 0;
            width: 95%;
            z-index: -1;
        }

这对你有帮助

   <div class="flex items-center">
      <div class="flex-grow bg bg-gray-300 h-0.5"></div>
      <div class="flex-grow-0 mx-5 text dark:text-white">or</div>
      <div class="flex-grow bg bg-gray-300 h-0.5"></div>
   </div>

献给所有喜欢顺风的人。 灵感来自于WellSpring的回答

下面是我对Bootstrap 5的简单解决方案，只使用预定义的类:

<div class="py-3 d-flex align-items-center">
    <hr class="flex-grow-1" />
    <div class="badge bg-secondary">OR</div>
    <hr class="flex-grow-1" />
</div>

结果:

你可以将它作为React组件重用，例如:

export default function Divider({ text }) {
    return <div className="py-3 d-flex align-items-center">
        <hr className="flex-grow-1" />
        <div className="badge bg-secondary">{ text }</div>
        <hr className="flex-grow-1" />
    </div>;
}

我一直在寻找这个简单的装饰的一些解决方案，我发现了相当多的，一些奇怪的，一些甚至用JS来计算字体的高度和bla,bla,bla，然后我读了这篇文章，读了一个评论从thirtydot谈到fieldset和传说，我认为这就是它。

我重写了这2个元素样式，我猜你可以复制它们的W3C标准，并将其包含在你的.middle-line-text类(或任何你想叫它的)中，但这是我所做的:

<fieldset class="featured-header">
    <legend>Your text goes here</legend>
</fieldset>

<style>
.featured-header{
    border-bottom: none;
    border-left: none;
    border-right: none;
    text-align: center;
 }

.featured-header legend{
    -webkit-padding-start: 8px; /* It sets the whitespace between the line and the text */
    -webkit-padding-end: 8px; 
    background: transparent; /** It's cool because you don't need to fill your bg-color as you would need to in some of the other examples that you can find (: */
    font-weight: normal; /* I preffer the text to be regular instead of bold  */
    color: YOU_CHOOSE;
}   

</style>

这是小提琴:http://jsfiddle.net/legnaleama/3t7wjpa2/

我玩了边界样式，它也可以在Android;)(在kitkat 4.XX上测试)

编辑:

遵循Bekerov Artur的想法，这也是一个不错的选择，我已经改变了。png base64图像创建一个。svg的笔画，这样你就可以在任何分辨率渲染，也可以改变元素的颜色，而不需要任何其他软件的参与:)

/* SVG solution based on Bekerov Artur */
/* Flexible solution, scalable, adaptable and also color customizable*/
.stroke {
background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' x='0px' y='0px' width='1px' height='1px' viewBox='0 0 1 1' enable-background='new 0 0 1 1' fill='%23ff6600' xml:space='preserve'><rect width='1' height='1'/></svg>");
background-repeat: repeat-x;
background-position: left;
text-align: center;
}
.stroke h3 {
background-color: #ffffff;
margin: 0 auto;
padding:0 10px;
display: inline-block;
font-size: 66px;
}

我已经尝试了大多数建议的方法，但结束了一些问题，如全宽度，或不适合动态内容。最后我修改了一个代码，并完美地工作。这个示例代码将在之前和之后绘制这些线条，并且在内容更改方面非常灵活。中心对齐。

HTML

        <div style="text-align:center"> 
            <h1>
                <span >S</span>
            </h1> 
        </div> 

        <div style="text-align:center"> 
            <h1>
                <span >Long text</span>
            </h1> 
        </div> 

CSS

      h1 {
            display: inline-block;
            position: relative;
            text-align: center;
        }

        h1 span {
            background: #fff;
            padding: 0 10px;
            position: relative;
            z-index: 1;
        }

        h1:before {
            background: #ddd;
            content: "";
            height: 1px;
            position: absolute;
            top: 50%;
            width: calc(100% + 50px);//Support in modern browsers
            left: -25px;
        }

        h1:before {
            left: ;
        }

结果: https://jsfiddle.net/fasilkk/vowqfnb9/

横线和竖线，中间有字

.box{ background-image: url("https://i.stack.imgur.com/N39wV.jpg"); width: 350px; padding: 10px; } /*begin first box*/ .first{ width: 300px; height: 100px; margin: 10px; border-width: 0 2px 0 2px; border-color: red; border-style: solid; position: relative; } .first span { position: absolute; display: flex; right: 0; left: 0; align-items: center; } .first .foo{ top: -8px; } .first .bar{ bottom: -8.5px; } .first span:before{ margin-right: 15px; } .first span:after { margin-left: 15px; } .first span:before , .first span:after { content: ' '; height: 2px; background: red; display: block; width: 50%; } /*begin second box*/ .second{ width: 300px; height: 100px; margin: 10px; border-width: 2px 0 2px 0; border-color: red; border-style: solid; position: relative; } .second span { position: absolute; top: 0; bottom: 0; display: flex; flex-direction: column; align-items: center; } .second .foo{ left: -15px; } .second .bar{ right: -15.5px; } .second span:before{ margin-bottom: 15px; } .second span:after { margin-top: 15px; } .second span:before , .second span:after { content: ' '; width: 2px; background: red; display: block; height: 50%; } <div class="box"> <div class="first"> <span class="foo">FOO</span> <span class="bar">BAR</span> </div> <br> <div class="second"> <span class="foo">FOO</span> <span class="bar">BAR</span> </div> </div>

这个问题也在https://stackoverflow.com/a/57279326/6569224得到了回答