added summary of create DOM
placeholder for inheritance performance
added minify example
added example for combine js files
added example for order of script and style
added rebull
added developer secret
updated image for asking for resources
added script tag blocking
added disclaimer
more junk image
added html
added script halt image
summary of netwrok improvement
tiny changes
crap about hoisting
modified execution context
modified execution context steps
added scope
added create new item for delete demo