How do i know what script running in element

How do i know what script running in element

title say it,
long version: my blog using template which contain script for shorting post content (summary), im trying to edit one by one script to increase summary length on my blog but nothing change.

I found almost similar script that contain 'summary' on my blog but every time i change the summary var larger than before, nothing change in the page, the summary of my post still too short.

so here im wondering is there any way to know what/which script that according from an element of my blog?

optional question ; and which script that unused on my blog (since im using free template, i know there's encrypted script, so i would like to remove the script to faster opening my blog).

side-story version: how to manually increase the summary with jquery even if there's another script already using for summary (if css i mean !important)?

short version: is there any script debugger for whole x/html (blogger) that answer my question?.

thanks