2.2.49 [HTML5:2014] Section 6.1.3.5 Killing scripts

C0066: There are no quota restrictions

The specification states:

 6.1.3.5 Killing scripts
  
     User agents may impose resource limitations on scripts, for example CPU quotas, 
     memory limits, total execution time limits, or bandwidth limitations. ...

IE11 Mode, IE10 Mode, IE9 Mode, and EdgeHTML Mode (All versions)

There are no quota restrictions.

C0065: The user can kill a script with the stop script feature

The specification states:

 6.1.3.5 Killing scripts
     ...
     User agents are encouraged to allow users to disable scripting whenever the user is 
     prompted either by a script (e.g. using the window.alert() API) or because of a 
     script's actions (e.g. because it has exceeded a time limit).
     ...
     User agents may allow users to specifically disable scripts just for the purposes of 
     closing a browsing context.

IE11 Mode, IE10 Mode, IE9 Mode, and EdgeHTML Mode (All versions)

The user can kill a script with the stop script feature.