What are the methods for finding the source of errors on sites with a bunch of obfuscated legacy code?

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veitsi2015-09-25 14:06:57

Web development

veitsi, 2015-09-25 14:06:57

Good day, dear web-building gurus. Now I am helping to finalize a site that has been working for a long time and has a bunch of confusing legacy code with zero documentation. The file structure is extremely difficult to understand what a particular module does. There are a number of open front-end bug reports.
Please tell me if there are any methods for localizing the sources of errors on the site. for example, they report that in a certain div the text is out of bounds or the wrong information is displayed. how to understand which css or js can be responsible for a given element?

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Alexander Varakosov, 2015-09-25
@thelongrunsmoke

Modern browsers have an almost exhaustive set of tools for this purpose.