我其实有个问题：去哪能测试网页程序和后端程序的最低适用的浏览器版本或者是服务器软件版本呢？比如我怎么测试我写的HTML页面最低适用那些浏览器？怎么测试我的PHP程序最低适用那个PHP版本？希望有大佬推荐
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