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pure CSS3 实现三角形icon的方法

border: color+transparent

transform : rotate() /rotateZ()

? 使用实体字符”◆“实现三角形效果

demo:

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		*{
			-webkit-overflow-scrolling: touch;
		}
		.container{
			 margin-left: 300px;
			 margin-top: 200px;
		}
		.box{
			60px;
		    height:60px;
		    /*border: 1px solid #0f0;*/
		    float: left;
		    position: relative;
		}
		.b1{
			background: #e66161;
		}
		.b1 .circle{
			 10px;
			height: 10px;
			background: #fff;
			position: absolute;
			border-radius: 5px;
			top: 25px;
			left: 60px;
			z-index: 9999;
		}
		.triangle{
		    0px;
		    height:0px;
		    border-30px;
		    border-style:solid;
		    /*border-color:#e66161 #f3bb5b #94e24f #85bfda;*/
		    border-color:transparent transparent transparent #e66161;
		    /*can not using border-radius, head is not the real triangle*/
		}
	</style>
</head>
<body>
	<div>
		<h1>-webkit-overflow-scrolling: touch;</h1>
	</div>
	<div class="container">
		<div class="box b1">
			<div class="circle">
				<!--  -->
			</div>
		</div>
		<div class="box">
			<div class="triangle">
				<!--  -->
			</div>
		</div>
	</div>
</body>
</html>

label Icon + font

demo-update:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{
            -webkit-overflow-scrolling: touch;
        }
        .container{
             margin-left: 300px;
             margin-top: 200px;
             background-color: #000;
             width: auto;
             height: auto;
             overflow: hidden;
        }
        .box{
            width:60px;
            height:60px;
            /*border: 1px solid #0f0;*/
            float: left;
            position: relative;
            border-radius: 7px 0 0 7px;
        }
        .b1{
            background: #2CCD76;
        }
        .b1 .circle{
            width: 10px;
            height: 10px;
            background: #fff;
            position: absolute;
            border-radius: 5px;
            top: 25px;
            left: 60px;
            z-index: 9999;
        }
        .b1 span{
            color: #fff;
            font-size: 1.5em;
            display: inline-block;
            /*text-align: center;*/
            /*justify-content: center;*/
            /*border: 1px solid red;*/
            margin: 25% 8.3%;
        }
        .triangle{
            width:0px;
            height:0px;
            border-width:30px;
            border-style:solid;
            /*border-color:#e66161 #f3bb5b #94e24f #85bfda;*/
            border-color:transparent transparent transparent #2CCD76;
            /*can not using border-radius, head is not the real triangle*/
        }
    </style>
    <style>
        .r-container{
             margin-left: 300px;
             margin-top: 10px;
             background-color: #000;
             width: auto;
             height: auto;
             overflow: hidden;
        }
        .r-box{
            width:60px;
            height:60px;
            /*border: 1px solid #0f0;*/
            float: left;
            position: relative;
            border-radius: 10px 7px 7px 10px;
            background: #2CCD76;
            z-index: 9999;
        }
        .r-box span{
            color: #fff;
            font-size: 1.5em;
            display: inline-block;
            /*text-align: center;*/
            /*justify-content: center;*/
            /*border: 1px solid red;*/
            margin: 25% 8.3%;
        }
        .rr{
            width:42.5px;
            height:42.5px;
            /*border: 1px solid #0f0;*/
            float: left;
            left: 35px;
            top: 9px;
            position: absolute;
            background: #2CCD76;
            transform: rotateZ(45deg);
            /* rotate center ???*/
            z-index: -1;
            border-radius: 3px 5px;
        }
        .rr .rc{
            width: 10px;
            height: 10px;
            background: #fff;
            position: absolute;
            border-radius: 5px;
            top: 10px;
            left: 22px;
        }
    </style>
</head>
<body>
    <div>
        <h1>-webkit-overflow-scrolling: touch;</h1>
    </div>
    <div class="container">
        <div class="box b1">
            <span>DEMO</span>
            <div class="circle">
                <!--  -->
            </div>
        </div>
        <div class="box">
            <div class="triangle">
                <!--  -->
            </div>
        </div>
    </div>
    <hr>
    <div class="r-container">
        <div class="r-box">
            <span>DEMO</span>
            <div class="rr">
                <div class="rc">
                    <!--  -->
                </div>
            </div>
        </div>
    </div>
</body>
</html>

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原文地址：https://www.cnblogs.com/xgqfrms/p/5947745.html