Use real browsers to test your website or application automatically.
There are several reasons a browser test can fail.
If enabled, a screenshot will be taken at the last step of the test. These final screenshots are validated against the first baseline screenshot. If this comparison fails you can update the baseline screenshot or increase the allowed difference threshold.
Your test steps can fail for a multitude of reasons. Most of the times it has to do with an element on your website that can’t be found or is not visible and has to be clicked, used as an input, etc.
By default, the browser will wait 30 seconds until the specified element of that step will be visible. Best practice when executing actions which trigger HTTP requests is to select a subsequent element which only becomes visible after the request is completed.