Hi
What causes this empty space? between html and css? (in the picture, the red arrow)
Hi
What causes this empty space? between html and css? (in the picture, the red arrow)
Most likely the browser is busy doing something else - could be loading js, parsing huge style sheets, etc. In some cases with some test environments the browser is actually updating itself or plugins.
Take a look at the CPU Utilization graph that appears underneath your waterfall - is that high?