svg 渐变 - SERP Analysis

https://developer.mozilla.org/zh-CN/docs/Web/SVG/Tutorials/SVG_from_scratch/Gradients

http://www.runoob.com/svg/svg-grad-linear.html

https://juejin.cn/post/7140589008144302116

https://zhuanlan.zhihu.com/p/515854742

https://blog.csdn.net/u012632105/article/details/132651883

https://docs.aspose.com/svg/zh/net/drawing-basics/filters-and-gradients/

https://www.cnblogs.com/geek1116/p/18017664

https://github.com/brucewar/svg-tutorial/blob/master/34.SVG%E6%B8%90%E5%8F%98.md

https://www.zhangxiaochun.com/svg-mix-gradients/

https://www.w3school.com.cn/svg/svg_grad_linear.asp