border-image: linear-gradient

border-image: linear-gradient是一个CSS属性，用于在边框上应用线性渐变背景图像。这个属性允许你将线性渐变图像应用到元素的边框上，以创建自定义的边框样式。通过指定线性渐变的起点和终点颜色，可以实现从一个颜色到另一个颜色的平滑过渡。border-image-source属性指定渐变图像的来源，border-image-slice属性用于控制图像的分割和定位。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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