why all browser behave differently for same code ? not most of code but sometime it annoying that some code running well in one browser ex. Mozilla Firefox , not work as it should be at IE(Internet Explorer). IE(Internet Explorer) have most issue with JavaScript or CSS even browser version also another headache . A JavaScript work with IE 10 , possibly not work with IE 8 , so one need to do extra code so it work with both. what is the reason all browser don not have same api for JavaScript or Css ? as a web developer we doing so much for Cross Browser compatibility , so its my right to know who cause it ? is it browser coded so or anything else ?

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