1. A computing device for client-level web application runtime control and multi-factor security analysis, the computing device comprising: at least one sensor; a browser to receive application code associated with a browser-based application from a web server; and a web security module to (i) collect real-time data generated by the at least one sensor, (ii) perform a multi-factor security assessment of the browser-based application as a function of the collected real-time data and the application code, (iii) determine whether the application code is modifiable to eliminate execution of impermissible code in response to an indication of the multi-factor security assessment that the application code includes the impermissible code, (iv) modify the application code in response to a determination that the application code is modifiable to eliminate the execution of the impermissible code, (v) establish a client-level web application runtime security policy associated with the browser-based application in response to the multi-factor security assessment, and (vi) enforce the client-level web application runtime security policy on the computing device, wherein the client-level web application runtime security policy identifies at least one of hardware, firmware, or software access rules to be enforced on the computing device.