Brief History

EcmaScript stuck at ES3 since 1999

Several attempts at feature “rich” ES4.

Successful ES3.1 simplification, renamed ES5

IE, FF implementations almost beta.

Progress at Opera,v8,…. Not yet Safari.

meld(ADsafe,Caja,…) → Secure EcmaScript

Four synergies between SES and ES5

ES-Harmony agreement on future directions

Lexical scoping, classes as sugar