1. A method comprising: obtaining multiple instances of web content, at least one of the multiple instances of web content including a script; displaying the multiple instances of web content embedded in an application concurrently with content of the application, including displaying a result of execution of the script, the multiple instances of displayed web content each having a different source; receiving, from the application, a trigger value; monitoring an amount of time the script has been executing against the trigger value; providing feedback to the application regarding performance for each of the respective multiple instances of displayed web content responsive to the trigger value being satisfied for as long as the web content is executing; allowing the application to alter execution of the web content in response to the feedback, the allowing the application to alter execution of the web content comprising terminating execution of a first instance of the displayed web content without altering execution of a second instance of the displayed web content; and ceasing to provide feedback to the application regarding performance for the first instance of web content when the first instance of web content is no longer executing.