How to make auto-stretch background image which compatible with both Firefox & smartphone?
First introduction, What is "Auto-Stretch"? Here, for example: https://s26.postimg.org/68fq371bd/Screenshot_70.png Congratulation to Lord Krishna (https://www.sololearn.com/Profile/4843153/?ref=app) His source code: https://code.sololearn.com/WWcL91up06DJ/?ref=app Image result: https://s26.postimg.org/dd0hietyh/Screenshot_79.png Calvin (https://www.sololearn.com/Profile/4354920/?ref=app): He is using cover. https://code.sololearn.com/WaW0j3MJ9CiH/?ref=app#css Please upvote their codes to appreciate their effort. Advice from Leigh E. O. (https://www.sololearn.com/Profile/4824451/?ref=app): Background-size: 100%, 100%; Result: Working on a smartphone, chrome, others, but not on Firefox. Because of browser prefix? I tried -moz-background-size: 100% 100%; But it's still not working, Image result: https://s26.postimg.org/y8mrtnq5l/Screenshot_78.png My Firefox version? My Firefox version already latest version, my browser is the auto update mode. https://s26.postimg.org/xqifmblt5/Screenshot_76.png