url('paper.gif')|url('img_tree.gif'), url('paper.gif')|conic-gradient(red, yellow, green)|linear-gradient(red, yellow, blue)|radial-gradient(red, green, blue)|repeating-conic-gradient(red 10%, yellow 20%)|repeating-linear-gradient(red, yellow 10%, green 20%)|repeating-radial-gradient(red, yellow 10%, green 15%)
此演示展示了一些不同的技巧，关于如何设置 HTML 元素的背景图片。