updated the fb like and comment reference
added link for whats worng with css box model
Update README.md
added follow up question for semantic
Merge branch 'master' of https://github.com/khan4019/front-end-Interview-Questions
added link to css and js1 questions
tiny changes
Update README.md
Update README.md
Update README.md
brought JS question in front end interview
Merge branch 'master' of https://github.com/khan4019/front-end-Interview-Questions
added async vs defer
updated asyn vs defer
added window.onload and document.onload
added new file
added five points for responsive websites
added two more points for responsive
added browser comptability steps
added compatibility test question