Are you finding it difficult from those instructions in post #83 to tell how to do it for one image?
For your belefit, I’ll supply an updated set of instructions for you here in that case, that relates to testing a single image instead of multiple images. Enjoy.
When you have three one images that you want to test, you want to start the timer before each of them it, and end the timer after each of them it. So your code will be:
script to start the timer for image 1
image 1
script to end the timer for image 1
script to start the timer for image 2
image 2
script to end the timer for image 2
script to start the timer for image 3
image 3
script to end the timer for image 3
What happens then? After all of the timers and images have been done, you’ll want to show the results for the timer.
So, you the have:
a div to show the results of the timers
a script that loops over uses each of the timers to create the measurement from each of them
a script that loops over uses those measurements and shows the result in the above results div
a script that cleans up the stored markers
Most of that is already done for you in the code that you pasted in post #77, but it will be scattered throughout the page in script tag blocks instead.