请教各位一个问题，求解答：关于canvas图片跨域问题十分感谢

Question

使用canvas绘图时，为什么不通过CORS使用图片会污染画布？按MND的说法是：可避免未经许可拉取远程网站信息而导致的用户隐私泄露。那是怎么通过加载图片导致用户隐私泄漏的？..
为什么普通在html中使用img标签或者css中使用background加载图片不需要走CORS去加载呢并且不泄漏隐私呢？
网上搜到的答案清一色是关于如何解决canvas跨域，请各路大佬传授一下新知识..

Answer 1

Becausethepixelsinacanvas'sbitmapcancomefromavarietyofsources,includingimagesorvideosretrievedfromotherhosts,it'sinevitablethatsecurityproblemsmayarise.AssoonasyoudrawintoacanvasanydatathatwasloadedfromanotheroriginwithoutCORSapproval,thecanvasbecomestainted.Ataintedcanvasisonewhichisnolongerconsideredsecure,andanyattemptstoretrieveimagedatabackfromthecanvaswillcauseanexceptiontobethrown.IfthesourceoftheforeigncontentisanHTMLorSVGelement,attemptingtoretrievethecontentsofthecanvasisn'tallowedYoucanreadmoreaboutthishere