blocks|key|2022068|text|尝试使用SVG|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2022069|<svg+xmlns="http://www.w3.org/2000/svg"+version="1.1">
++<polygon+points="200,10+250,190+160,210"
++style="fill:lime;stroke:purple;stroke-width:1"/>
</svg>|code-block|syntax|javascript|2022070|这是教程|2022071|entityMap|0|LINK|mutability|MUTABLE|url|http://www.svgbasics.com/paths.html^0|4|3|0|0|2|2|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

<p>Try using <code>SVG</code></p>

<pre><code>&lt;svg xmlns="http://www.w3.org/2000/svg" version="1.1"&gt;
  &lt;polygon points="200,10 250,190 160,210"
  style="fill:lime;stroke:purple;stroke-width:1"/&gt;
&lt;/svg&gt;
</code></pre>

<p>Here is the <strong><a href="http://www.svgbasics.com/paths.html" rel="noreferrer">tutorial</a></strong></p>


blocks|key|2022106|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2022107|++++.triangle{
++++++++width:0;
++++++++border-bottom:solid+30px+black;
++++++++border-right:solid+30px+transparent;
++++++++border-left:solid+30px+transparent;
++++}|code-block|syntax|javascript|2022108|++++<div+class="triangle">
++++</div>|2022109|2022110|这将是一个指向顶部的三角形。不要将边框指定到需要指向的边框。|2022111|上面是一个等边三角形。移除border-left使其成为直角三角形.|offset|length|style|CODE|2022112|entityMap^0|0|0|0|0|0|D|B|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|I|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|X|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|Y|8|@$N|Z|O|10|P|Q]]|9|@]|A|$]]|$1|R|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|S|$]]

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>    .triangle{
        width:0;
        border-bottom:solid 30px black;
        border-right:solid 30px transparent;
        border-left:solid 30px transparent;
    }</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>    &lt;div class="triangle"&gt;
    &lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>This will be a triangle pointed towards the top. Don't specify the border to the side where you need it to be pointed.</p>

<p>The above is an equilateral triangle. Remove <code>border-left</code> to make it a right-angled triangle.</p>


blocks|key|699176|text|CSS-边框版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|699177|.triangle+{
++++position:+relative;
++++width:0;
++++border-bottom:solid+50px+black;
++++border-right:solid+30px+transparent;
++++border-left:solid+30px+transparent;
}
.triangle+.empty+{
++++position:+absolute;
++++top:9px;
++++left:-21px;
++++width:0;
++++border-bottom:solid+36px+white;
++++border-right:solid+21px+transparent;
++++border-left:solid+21px+transparent;
}|code-block|syntax|javascript|699178|在黑色三角形中添加一个白色三角形：http://jsfiddle.net/samliew/Hcfsx/|offset|length|699179|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/samliew/Hcfsx/^0|0|0|H|Y|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<p>CSS-border version:</p>

<pre><code>.triangle {
    position: relative;
    width:0;
    border-bottom:solid 50px black;
    border-right:solid 30px transparent;
    border-left:solid 30px transparent;
}
.triangle .empty {
    position: absolute;
    top:9px;
    left:-21px;
    width:0;
    border-bottom:solid 36px white;
    border-right:solid 21px transparent;
    border-left:solid 21px transparent;
}
</code></pre>

<p>Adding a white triangle inside the black one: <a href="http://jsfiddle.net/samliew/Hcfsx/">http://jsfiddle.net/samliew/Hcfsx/</a></p>


blocks|key|699201|text|考虑使用元素。我在小提琴上建立了一个简单的三角形--还没什么特别之处。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|699202|​|699203|++++var+canvas+=+document.getElementById('myCanvas');
++++var+context+=+canvas.getContext('2d');

++++context.beginPath();
++++context.moveTo(10,+0);
++++context.lineTo(20,+20);
++++context.lineTo(0,+20);
++++context.closePath();
++++context.fill();|code-block|syntax|javascript|699204|<canvas+id="myCanvas"+width="20"+height="20"></canvas>|699205|699206|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/q9zPt/^0|9|3|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|10|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|M|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|N|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|O|$P|$5|Q|R|S|C|$T|U]]]]

<p>Consider using the <a href="http://caniuse.com/#feat=canvas" rel="nofollow noreferrer"><code>&lt;canvas&gt;</code></a> element. I build a simple triangle on <a href="http://jsfiddle.net/q9zPt/" rel="nofollow noreferrer">jsfiddle</a> - nothing fancy, yet.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>    var canvas = document.getElementById('myCanvas');
    var context = canvas.getContext('2d');

    context.beginPath();
    context.moveTo(10, 0);
    context.lineTo(20, 20);
    context.lineTo(0, 20);
    context.closePath();
    context.fill();</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;canvas id="myCanvas" width="20" height="20"&gt;&lt;/canvas&gt;</code></pre>
</div>
</div>
</p>


blocks|key|2810191|text|我找到了一个webkit-only解决方案，使用▲字符：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2810192|​|2810193|.triangle+{
++-webkit-text-stroke:+12px+black;
++color:+transparent;
++font-size:+200px;
}|code-block|syntax|javascript|2810194|<div+class="triangle">&#9650;</div>|2810195|2810196|临时演员：|2810197|CanIUse参考+for+text-stroke+-截至2019年所有主要浏览器都覆盖了|unordered-list-item|CODE|2810198|CSS-技巧文章|2810199|有用的HTML形状|2810200|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/WebKit|1|http://caniuse.com/text-stroke|2|http://css-tricks.com/adding-stroke-to-web-text/|3|http://mcdlr.com/8/^0|C|5|6|6|0|0|0|0|0|0|0|E|B|R|I|0|9|1|0|0|6|2|0|0|9|3|0^^$0|@$1|2|3|4|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|F|3|G|5|6|7|1J|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1K|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|J|7|1L|8|@]|D|@]|E|$K|L]]|$1|O|3|G|5|6|7|1M|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1N|8|@]|D|@]|E|$]]|$1|R|3|S|5|T|7|1O|8|@$9|1P|A|1Q|B|U]|$9|1R|A|1S|B|C]]|D|@$9|1T|A|1U|1|1V]]|E|$]]|$1|V|3|W|5|T|7|1W|8|@]|D|@$9|1X|A|1Y|1|1Z]]|E|$]]|$1|X|3|Y|5|T|7|20|8|@]|D|@$9|21|A|22|1|23]]|E|$]]|$1|Z|3|-4|5|6|7|24|8|@]|D|@]|E|$]]]|10|$11|$5|12|13|14|E|$15|16]]|17|$5|12|13|14|E|$15|18]]|19|$5|12|13|14|E|$15|1A]]|1B|$5|12|13|14|E|$15|1C]]]]

<p>I've found a <strong><a href="http://en.wikipedia.org/wiki/WebKit" rel="noreferrer">webkit</a>-only</strong> solution, using the &#9650; character:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.triangle {
  -webkit-text-stroke: 12px black;
  color: transparent;
  font-size: 200px;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="triangle"&gt;&amp;#9650;&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>Extras:</p>

<ul>
<li><a href="http://caniuse.com/text-stroke" rel="noreferrer">CanIUse reference</a> for <code>text-stroke</code> - <strong>all major browsers covered as of 2019</strong></li>
<li><a href="http://css-tricks.com/adding-stroke-to-web-text/" rel="noreferrer">CSS-tricks</a> article</li>
<li><a href="http://mcdlr.com/8/" rel="noreferrer">Useful HTML shapes</a></li>
</ul>


blocks|key|2022317|text|您可以使用我在这里描述的方法:带有旋转伪元素的这个CSS三角形是如何工作的？。然后，您可以向旋转的伪元素添加一个边框，以创建正在寻找的效果。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2022318|您还可以使用此技术显示具有图像、渐变或任何非普通背景边框的三角形：|2022319|演示|2022320|​|2022321|.tr{
++width:40%25;
++padding-bottom:+28.28%25;+/*+=+width+/+sqrt(2)+*/
++position:relative;
++border-bottom:+6px+solid+rgba(0,0,0,0.8);
++border-right:+6px+solid+transparent;
++border-left:+6px+solid+transparent;
++overflow:hidden;
}
.tr:before{
++content:'';
++position:absolute;
++bottom:0;+left:0;
++width:100%25;+height:100%25;
++border-top:6px+solid+rgba(0,0,0,0.8);
++border-left:6px+solid+rgba(0,0,0,0.8);
++
++-moz-box-sizing:border-box;
++box-sizing:border-box;
++++
++-webkit-transform-origin:0+100%25;
++-ms-transform-origin:0+100%25;
++transform-origin:0+100%25;
++++
++-webkit-transform:+rotate(45deg);
++-ms-transform:+rotate(45deg);
++transform:+rotate(45deg);
}


/*+FOLLOWING+JUST+FOR+THE+DEMO+*/
body{background:url('https://picsum.photos/id/100/1000/1000');background-size:cover;}|code-block|syntax|javascript|2022322|<div+class="tr"></div>|2022323|2022324|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/7073484/how-does-this-css-triangle-shape-work/24808936#24808936|1|http://codepen.io/web-tiki/pen/JnLGb^0|N|F|0|0|0|0|2|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|1B|8|@]|9|@]|C|$M|N]]|$1|O|3|P|5|L|7|1C|8|@]|9|@]|C|$M|N]]|$1|Q|3|I|5|6|7|1D|8|@]|9|@]|C|$]]|$1|R|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|S|$T|$5|U|V|W|C|$X|Y]]|Z|$5|U|V|W|C|$X|10]]]]

<p>You can use the method I described here : <a href="https://stackoverflow.com/questions/7073484/how-does-this-css-triangle-shape-work/24808936#24808936">How does this CSS triangle shape work?</a> with a rotated pseudo element. You can then add a border to the rotated pseudo element to create the effect you are looking for. </p>

<p>You can also use this technique to display the triangle with borders over an image, gradient or any non plain backgrounds :</p>

<p><strong><a href="http://codepen.io/web-tiki/pen/JnLGb" rel="nofollow noreferrer">DEMO</a></strong></p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.tr{
  width:40%;
  padding-bottom: 28.28%; /* = width / sqrt(2) */
  position:relative;
  border-bottom: 6px solid rgba(0,0,0,0.8);
  border-right: 6px solid transparent;
  border-left: 6px solid transparent;
  overflow:hidden;
}
.tr:before{
  content:'';
  position:absolute;
  bottom:0; left:0;
  width:100%; height:100%;
  border-top:6px solid rgba(0,0,0,0.8);
  border-left:6px solid rgba(0,0,0,0.8);
  
  -moz-box-sizing:border-box;
  box-sizing:border-box;
    
  -webkit-transform-origin:0 100%;
  -ms-transform-origin:0 100%;
  transform-origin:0 100%;
    
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
}


/* FOLLOWING JUST FOR THE DEMO */
body{background:url('https://picsum.photos/id/100/1000/1000');background-size:cover;}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="tr"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>


blocks|key|699420|text|我找到了一个很好的解决方案，有点棘手，但对我来说，这是最简单的方法：链接到代码笔|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|699421|.triangle+{
position:+absolute;
margin:+auto;
top:+-70px;
left:+0;
right:+0;
width:+137px;
height:+137px;
transform:+rotate(45deg);
-webkit-transform:+rotate(45deg);
-moz-transform:+rotate(45deg);
-o-transform:+rotate(45deg);
-ms-transform:+rotate(45deg);
border-right:+4px+solid+#e74c3c;
border-bottom:+4px+solid+#e74c3c;|code-block|syntax|javascript|699422|}|699423|entityMap|0|LINK|mutability|MUTABLE|url|https://codepen.io/creme/pen/ntvqe^0|Y|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<p>I found a nice solution, a bit tricky but for me it was the most easy way to do it:
<a href="https://codepen.io/creme/pen/ntvqe" rel="nofollow noreferrer">link to code-pen</a></p>

<pre><code>.triangle {
position: absolute;
margin: auto;
top: -70px;
left: 0;
right: 0;
width: 137px;
height: 137px;
transform: rotate(45deg);
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-o-transform: rotate(45deg);
-ms-transform: rotate(45deg);
border-right: 4px solid #e74c3c;
border-bottom: 4px solid #e74c3c;
</code></pre>

<p>}</p>


blocks|key|2810408|text|这里有一个使用多背景和linear-gradient的想法|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2810409|​|2810410|.triangle+{
++width:100px;
++height:100px;
++
++background:
++++/*+Left+side+*/
++++linear-gradient(to+bottom+left,
++++++transparent+49.5%25,#000+50%25+calc(50%25+%2B+10px),
++++++transparent+calc(50%25+%2B+11px))+right/50%25+100%25,
++++/*+right+side+*/
++++linear-gradient(to+bottom+right,
++++++transparent+49.5%25,#000+50%25+calc(50%25+%2B+10px),
++++++transparent+calc(50%25+%2B+11px))+left/50%25+100%25,
++++/*+bottom+side*/
++++linear-gradient(#000,#000)+bottom/calc(100%25+-+20px)+10px;
++background-repeat:no-repeat;
}|code-block|syntax|javascript|2810411|<div+class="triangle"></div>|2810412|2810413|您可以考虑CSS变量来轻松地调整形状：|2810414|2810415|.triangle+{
++--t:10px;++/*+Thickness+*/
++--c:black;+/*+Color+*/

++width:100px;
++height:100px;
++display:inline-block;
++
++background:
++++/*+Left+side+*/
++++linear-gradient(to+bottom+left,
++++++transparent+49.5%25,var(--c)+50%25+calc(50%25+%2B+var(--t)),
++++++transparent+calc(50%25+%2B+var(--t)+%2B+1px))+right/50%25+100%25,
++++/*+right+side+*/
++++linear-gradient(to+bottom+right,
++++++transparent+49.5%25,var(--c)+50%25+calc(50%25+%2B+var(--t)),
++++++transparent+calc(50%25+%2B+var(--t)+%2B+1px))+left/50%25+100%25,
++++/*+bottom+side*/
++++linear-gradient(var(--c),var(--c))+bottom/calc(100%25+-+2*var(--t))+var(--t);
++background-repeat:no-repeat;
}

body+{
+background:pink;
}|2810416|<div+class="triangle"></div>

<div+class="triangle"+style="--t:5px;--c:blue;width:150px"></div>

<div+class="triangle"+style="--t:8px;--c:red;height:150px"></div>

<div+class="triangle"+style="--t:15px;--c:green;width:80px"></div>|2810417|2810418|2810419|📷|atomic|2810420|2810421|具有较低梯度的不同语法：|2810422|2810423|.triangle+{
++--t:10px;++/*+Thickness+*/
++--c:black;+/*+Color+*/

++width:100px;
++height:100px;
++display:inline-block;
++border:var(--t)+solid+transparent;
++border-bottom-color:var(--c);
++background:
++++/*+Left+side+*/
++++linear-gradient(to+bottom+left,
++++++transparent+49.5%25,var(--c)+50%25+calc(50%25+%2B+var(--t)),
++++++transparent+calc(50%25+%2B+var(--t)+%2B+1px))+right,
++++/*+right+side+*/
++++linear-gradient(to+bottom+right,
++++++transparent+49.5%25,var(--c)+50%25+calc(50%25+%2B+var(--t)),
++++++transparent+calc(50%25+%2B+var(--t)+%2B+1px))+left;
++background-size:50%25+100%25;
++background-origin:border-box;
++background-repeat:no-repeat;
}

body+{
+background:pink;
}|2810424|<div+class="triangle"></div>

<div+class="triangle"+style="--t:5px;--c:blue;width:150px"></div>

<div+class="triangle"+style="--t:8px;--c:red;height:150px"></div>

<div+class="triangle"+style="--t:15px;--c:green;width:80px"></div>|2810425|2810426|您可以考虑创建矩形三角形的相同想法。|BOLD|2810427|2810428|.triangle+{
++--t:10;++/*+Thickness+*/
++--c:black;+/*+Color+*/

++width:100px;
++height:100px;
++display:inline-block;
++border:calc(var(--t)*1px)+solid+transparent;
++border-image:
++++linear-gradient(to+bottom+left,
++++++transparent+49.5%25,var(--c)+50%25)+var(--t);
++background:
++++/*+Left+side+*/
++++linear-gradient(to+bottom+left,
++++++transparent+49.5%25,var(--c)+50%25+calc(50%25+%2B+var(--t)*1px),
++++++transparent+calc(50%25+%2B+var(--t)*1px+%2B+1px));
++background-origin:border-box;
++background-repeat:no-repeat;
}

body+{
+background:pink;
}|2810429|<div+class="triangle"></div>

<div+class="triangle"+style="--t:5;--c:blue;width:150px"></div>

<div+class="triangle"+style="--t:8;--c:red;height:150px"></div>

<div+class="triangle"+style="--t:15;--c:green;width:80px"></div>|2810430|2810431|2810432|2810433|2810434|如果您想要一个等边三角形，只需使用初始代码在宽度/高度之间保持一个比率。|2810435|2810436|.triangle+{
++--t:10px;++/*+Thickness+*/
++--c:black;+/*+Color+*/

++width:100px;
++display:inline-block;
++border:var(--t)+solid+transparent;
++border-bottom-color:var(--c);
++background:
++++/*+Left+side+*/
++++linear-gradient(to+bottom+left,
++++++transparent+49.5%25,var(--c)+50%25+calc(50%25+%2B+var(--t)),
++++++transparent+calc(50%25+%2B+var(--t)+%2B+1px))+right,
++++/*+right+side+*/
++++linear-gradient(to+bottom+right,
++++++transparent+49.5%25,var(--c)+50%25+calc(50%25+%2B+var(--t)),
++++++transparent+calc(50%25+%2B+var(--t)+%2B+1px))+left;
++background-size:50%25+100%25;
++background-origin:border-box;
++background-repeat:no-repeat;
}

.triangle:before+{
++content:"";
++display:block;
++padding-top:86.6%25;
}

body+{
+background:pink;
}|2810437|<div+class="triangle"></div>

<div+class="triangle"+style="--t:5px;--c:blue;width:150px"></div>

<div+class="triangle"+style="--t:8px;--c:red;width:50px"></div>

<div+class="triangle"+style="--t:15px;--c:green;width:80px"></div>|2810438|2810439|2810440|2810441|2810442|有关计算的更多详细信息，有关答案：CSS三角形是如何工作的？|2810443|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/7b0b7fb677c7c0dbafe4c0bb378dd492.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/39d3af59c1cbca6a1c1e643d4fa5884f.png|2|https://developer.qcloudimg.com/http-save/yehe-900000/cab008e0a245cbe9b26bc6bc9c4d1246.png|3|LINK|MUTABLE|url|https://stackoverflow.com/a/49696143/8620333^0|B|F|0|0|0|0|0|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|7|5|0|0|0|0|0|0|0|1|1|0|0|7|6|0|0|0|0|0|0|0|1|2|0|0|H|D|3|0^^$0|@$1|2|3|4|5|6|7|2H|8|@$9|2I|A|2J|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|2K|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|2L|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|J|7|2M|8|@]|D|@]|E|$K|L]]|$1|O|3|G|5|6|7|2N|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|2O|8|@]|D|@]|E|$]]|$1|R|3|G|5|6|7|2P|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|2Q|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|J|7|2R|8|@]|D|@]|E|$K|L]]|$1|W|3|G|5|6|7|2S|8|@]|D|@]|E|$]]|$1|X|3|G|5|6|7|2T|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|10|7|2U|8|@]|D|@$9|2V|A|2W|1|2X]]|E|$]]|$1|11|3|G|5|6|7|2Y|8|@]|D|@]|E|$]]|$1|12|3|13|5|6|7|2Z|8|@]|D|@]|E|$]]|$1|14|3|G|5|6|7|30|8|@]|D|@]|E|$]]|$1|15|3|16|5|J|7|31|8|@]|D|@]|E|$K|L]]|$1|17|3|18|5|J|7|32|8|@]|D|@]|E|$K|L]]|$1|19|3|G|5|6|7|33|8|@]|D|@]|E|$]]|$1|1A|3|1B|5|6|7|34|8|@$9|35|A|36|B|1C]]|D|@]|E|$]]|$1|1D|3|G|5|6|7|37|8|@]|D|@]|E|$]]|$1|1E|3|1F|5|J|7|38|8|@]|D|@]|E|$K|L]]|$1|1G|3|1H|5|J|7|39|8|@]|D|@]|E|$K|L]]|$1|1I|3|G|5|6|7|3A|8|@]|D|@]|E|$]]|$1|1J|3|G|5|6|7|3B|8|@]|D|@]|E|$]]|$1|1K|3|Z|5|10|7|3C|8|@]|D|@$9|3D|A|3E|1|3F]]|E|$]]|$1|1L|3|G|5|6|7|3G|8|@]|D|@]|E|$]]|$1|1M|3|1N|5|6|7|3H|8|@$9|3I|A|3J|B|1C]]|D|@]|E|$]]|$1|1O|3|G|5|6|7|3K|8|@]|D|@]|E|$]]|$1|1P|3|1Q|5|J|7|3L|8|@]|D|@]|E|$K|L]]|$1|1R|3|1S|5|J|7|3M|8|@]|D|@]|E|$K|L]]|$1|1T|3|G|5|6|7|3N|8|@]|D|@]|E|$]]|$1|1U|3|G|5|6|7|3O|8|@]|D|@]|E|$]]|$1|1V|3|Z|5|10|7|3P|8|@]|D|@$9|3Q|A|3R|1|3S]]|E|$]]|$1|1W|3|G|5|6|7|3T|8|@]|D|@]|E|$]]|$1|1X|3|1Y|5|6|7|3U|8|@]|D|@$9|3V|A|3W|1|3X]]|E|$]]|$1|1Z|3|-4|5|6|7|3Y|8|@]|D|@]|E|$]]]|20|$21|$5|22|23|24|E|$25|26|27|-4]]|28|$5|22|23|24|E|$25|29|27|-4]]|2A|$5|22|23|24|E|$25|2B|27|-4]]|2C|$5|2D|23|2E|E|$2F|2G]]]]

<p>Here is an idea using multiple background and <code>linear-gradient</code>:</p>

<p><div class="snippet" data-lang="js" data-hide="true" data-console="true" data-babel="false">
<div class="snippet-code snippet-currently-hidden">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.triangle {
  width:100px;
  height:100px;
  
  background:
    /* Left side */
    linear-gradient(to bottom left,
      transparent 49.5%,#000 50% calc(50% + 10px),
      transparent calc(50% + 11px)) right/50% 100%,
    /* right side */
    linear-gradient(to bottom right,
      transparent 49.5%,#000 50% calc(50% + 10px),
      transparent calc(50% + 11px)) left/50% 100%,
    /* bottom side*/
    linear-gradient(#000,#000) bottom/calc(100% - 20px) 10px;
  background-repeat:no-repeat;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="triangle"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>You can consider CSS variables to easily adjust the shape:</p>

<p><div class="snippet" data-lang="js" data-hide="true" data-console="true" data-babel="false">
<div class="snippet-code snippet-currently-hidden">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.triangle {
  --t:10px;  /* Thickness */
  --c:black; /* Color */

  width:100px;
  height:100px;
  display:inline-block;
  
  background:
    /* Left side */
    linear-gradient(to bottom left,
      transparent 49.5%,var(--c) 50% calc(50% + var(--t)),
      transparent calc(50% + var(--t) + 1px)) right/50% 100%,
    /* right side */
    linear-gradient(to bottom right,
      transparent 49.5%,var(--c) 50% calc(50% + var(--t)),
      transparent calc(50% + var(--t) + 1px)) left/50% 100%,
    /* bottom side*/
    linear-gradient(var(--c),var(--c)) bottom/calc(100% - 2*var(--t)) var(--t);
  background-repeat:no-repeat;
}

body {
 background:pink;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="triangle"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:5px;--c:blue;width:150px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:8px;--c:red;height:150px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:15px;--c:green;width:80px"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p><a href="https://i.stack.imgur.com/zXMgv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zXMgv.png" alt="CSS triangle with border"></a></p>

<p>A different syntax with less gradient:</p>

<p><div class="snippet" data-lang="js" data-hide="true" data-console="true" data-babel="false">
<div class="snippet-code snippet-currently-hidden">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.triangle {
  --t:10px;  /* Thickness */
  --c:black; /* Color */

  width:100px;
  height:100px;
  display:inline-block;
  border:var(--t) solid transparent;
  border-bottom-color:var(--c);
  background:
    /* Left side */
    linear-gradient(to bottom left,
      transparent 49.5%,var(--c) 50% calc(50% + var(--t)),
      transparent calc(50% + var(--t) + 1px)) right,
    /* right side */
    linear-gradient(to bottom right,
      transparent 49.5%,var(--c) 50% calc(50% + var(--t)),
      transparent calc(50% + var(--t) + 1px)) left;
  background-size:50% 100%;
  background-origin:border-box;
  background-repeat:no-repeat;
}

body {
 background:pink;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="triangle"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:5px;--c:blue;width:150px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:8px;--c:red;height:150px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:15px;--c:green;width:80px"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>You can consider the same idea to create a <strong>rectangle triangle</strong>:</p>

<p><div class="snippet" data-lang="js" data-hide="true" data-console="true" data-babel="false">
<div class="snippet-code snippet-currently-hidden">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.triangle {
  --t:10;  /* Thickness */
  --c:black; /* Color */

  width:100px;
  height:100px;
  display:inline-block;
  border:calc(var(--t)*1px) solid transparent;
  border-image:
    linear-gradient(to bottom left,
      transparent 49.5%,var(--c) 50%) var(--t);
  background:
    /* Left side */
    linear-gradient(to bottom left,
      transparent 49.5%,var(--c) 50% calc(50% + var(--t)*1px),
      transparent calc(50% + var(--t)*1px + 1px));
  background-origin:border-box;
  background-repeat:no-repeat;
}

body {
 background:pink;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="triangle"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:5;--c:blue;width:150px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:8;--c:red;height:150px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:15;--c:green;width:80px"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p><a href="https://i.stack.imgur.com/ryUex.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ryUex.png" alt="CSS triangle with border"></a></p>

<p>If you want an <strong>equilateral triangle</strong> simply keep a ratio bettween the width/height using the initial code</p>

<p><div class="snippet" data-lang="js" data-hide="true" data-console="true" data-babel="false">
<div class="snippet-code snippet-currently-hidden">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.triangle {
  --t:10px;  /* Thickness */
  --c:black; /* Color */

  width:100px;
  display:inline-block;
  border:var(--t) solid transparent;
  border-bottom-color:var(--c);
  background:
    /* Left side */
    linear-gradient(to bottom left,
      transparent 49.5%,var(--c) 50% calc(50% + var(--t)),
      transparent calc(50% + var(--t) + 1px)) right,
    /* right side */
    linear-gradient(to bottom right,
      transparent 49.5%,var(--c) 50% calc(50% + var(--t)),
      transparent calc(50% + var(--t) + 1px)) left;
  background-size:50% 100%;
  background-origin:border-box;
  background-repeat:no-repeat;
}

.triangle:before {
  content:"";
  display:block;
  padding-top:86.6%;
}

body {
 background:pink;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="triangle"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:5px;--c:blue;width:150px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:8px;--c:red;width:50px"&gt;&lt;/div&gt;

&lt;div class="triangle" style="--t:15px;--c:green;width:80px"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p><a href="https://i.stack.imgur.com/eKcUw.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eKcUw.png" alt="CSS triangle with border"></a></p>

<p>Related answer for more details about the calculation: <a href="https://stackoverflow.com/a/49696143/8620333">How do CSS triangles work?</a></p>


blocks|key|699545|text|clip-path也可以考虑：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|699546|​|699547|html+{
++/*+init+size+and+shape+to+the+triangle*/
++--base:+155px;
++--ratio:+1;
++/*+try+too+0.71*/
++;
}

[data-triangle]+{
++width:+var(--base);
++height:+calc(var(--base)+*+var(--ratio));
++clip-path:+polygon(+0+100%25,+50%25+0,+100%25+100%25,+94%25+96%25,+50%25+8%25,+6%25+96%25,+96%25+96%25,+100%25+100%25);
++background:+gray;
}


/*+demo+makup+*/

html+{
++display:+grid;
++min-height:+100vh;
}

body+{
++background:+repeating-linear-gradient(45deg,+silver+0,+#444,+gold,+blue,+lime,+tomato,+purple,+gray+5em)+0+0+/+100%25+100%25;
++margin:+auto;
++text-align:+center;
++box-shadow:+inset+0+0+0+100vw+rgba(0,+0,+0,+0.5),+0+0+0+100vw+rgba(0,+0,+0,+0.5);
++color:gray
}

[data-triangle]+{
++transition:+1s;
}

body:hover+[data-triangle]{
++background:+black;
}

body:hover+{
++filter:+drop-shadow(0+0+1px+gold)drop-shadow(0+0+1px+white)drop-shadow(0+0+1px+white)drop-shadow(0+0+1px+white)drop-shadow(0+0+1px+white)drop-shadow(0+0+10px+white);
++/*make+that+triangle+obvious+over+that+funny+gradient*/
++color:+transparent;
++box-shadow:+0+0;
}


}|code-block|syntax|javascript|699548|<div+data-triangle></div>
hover+to+highlight|699549|699550|要帮助您创建clip-path，可以使用此联机工具https://bennettfeely.com/clippy/|699551|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/CSS/clip-path|1|https://bennettfeely.com/clippy/^0|0|9|0|9|0|0|0|0|0|0|6|9|P|W|1|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@$9|14|A|15|1|16]]|E|$]]|$1|F|3|G|5|6|7|17|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|O|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|R|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|S|$T|$5|U|V|W|E|$X|Y]]|Z|$5|U|V|W|E|$X|10]]]]

<p><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/clip-path" rel="nofollow noreferrer"><code>clip-path</code></a> could also be considered:</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>html {
  /* init size and shape to the triangle*/
  --base: 155px;
  --ratio: 1;
  /* try too 0.71*/
  ;
}

[data-triangle] {
  width: var(--base);
  height: calc(var(--base) * var(--ratio));
  clip-path: polygon( 0 100%, 50% 0, 100% 100%, 94% 96%, 50% 8%, 6% 96%, 96% 96%, 100% 100%);
  background: gray;
}


/* demo makup */

html {
  display: grid;
  min-height: 100vh;
}

body {
  background: repeating-linear-gradient(45deg, silver 0, #444, gold, blue, lime, tomato, purple, gray 5em) 0 0 / 100% 100%;
  margin: auto;
  text-align: center;
  box-shadow: inset 0 0 0 100vw rgba(0, 0, 0, 0.5), 0 0 0 100vw rgba(0, 0, 0, 0.5);
  color:gray
}

[data-triangle] {
  transition: 1s;
}

body:hover [data-triangle]{
  background: black;
}

body:hover {
  filter: drop-shadow(0 0 1px gold)drop-shadow(0 0 1px white)drop-shadow(0 0 1px white)drop-shadow(0 0 1px white)drop-shadow(0 0 1px white)drop-shadow(0 0 10px white);
  /*make that triangle obvious over that funny gradient*/
  color: transparent;
  box-shadow: 0 0;
}


}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div data-triangle&gt;&lt;/div&gt;
hover to highlight</code></pre>
</div>
</div>
</p>
<p>to help you create your <code>clip-path</code>, you can use this online tool <a href="https://bennettfeely.com/clippy/" rel="nofollow noreferrer">https://bennettfeely.com/clippy/</a></p>


<p>How can I create the following shape with CSS?</p>

<p><img src="https://i.stack.imgur.com/yCC87.png" alt="Enter image description here"></p>

<p>I tried this to be a solution:</p>

<pre><code> .triangle:after {
        position:absolute;
        content:"";
        width: 0;
        height: 0;
        margin-top:1px;
        margin-left:2px;
        border-left: 10px solid transparent;
        border-right: 10px solid transparent;
        border-bottom: 10px solid white;
    }

    .triangle:before {
        position:absolute;
        content:"";
        width: 0;
        height: 0;
        border-left: 12px solid transparent;
        border-right: 12px solid transparent;
        border-bottom: 12px solid black;
    }
</code></pre>

<p>You can see it working at <em><a href="http://jsfiddle.net/KEWBD/" rel="nofollow noreferrer">Triangle</a></em>. This is working, but with a trick of borders. Is there another way it could be done?</p>

<p>Using SVG vectors this can be done easily, but I don't want to go that lengthy way.</p>


How to create a transparent triangle with border using CSS?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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