Timelines Tab

The Timelines Tab contains all of the performance profiling and introspection tools provided by Web Inspector, organized into different timelines each with their own area of interest and specialized interface.

Layers Tab

After the position and size of each DOM node has been calculated, they are drawn onto a series of surfaces called layers, which are then composited in a particular order to produce the resulting appearance of the web page.

Console Object API

The console object is arguably one of the most useful debugging tools available for JavaScript.