Debugging trails
Works here. Fails there. Find out why.
Six lessons and three guided cases for the journey from local files to a published site.
Follow the evidence one step at a time. These original simulations do not connect to a target site or read anything from your computer.
One capital letter. One missing image.
Follow a missing image from its request to the exact filename.
Follow three steps →The image that disappears one level down
Resolve a relative URL before reaching for a server setting.
Follow three steps →The colour that refuses to change
Separate a stale build from browser and hosting cache guesses.
Follow three steps →Build your diagnostic toolkit
- Resolve paths on the deployed site
- Catch the capital letter
- Is it the upload or the cache?
- A missing page needs the right response
- Find blocked resources on HTTPS pages
- Read the browser’s evidence
No account, score tracking or saved progress. Reloading starts a new attempt.