WidthDiff

Description: This technique detects the opening of the DevTools by comparing the inner- and outerWidth of the window. Instead of proving a custom implementation, this code is directly taken from the devtools-detect module by sindresorhus.

Experiment: Open the DevTools after the page has loaded and see what happens to the content.

Impact:This technique, at least in theory, could be effective, as it could stealthily alter the behavior of the code as soon as open DevTools are detected. For example, this could prevent malicious code to trigger in the first place. However, this implementation in particular can be tricked by opening the DevTools in "detached" mode, i.e. in a separate window.