https://blog.wongcw.com/2018/12/05/google-chrome-71%e3%80%81firefox-65-%e7%9a%84%e5%b1%8f%e8%94%bd%e6%81%b6%e6%84%8f%e7%bd%91%e7%ab%99%e7%9a%84%e5%b9%bf%e5%91%8a%e5%92%8c-webp-%e6%a0%bc%e5%bc%8f%e5%9b%be%e7%89%87%e6%94%af%e6%8c%81/