Inspect
Description
Similar to viewing page source to find hidden information. Here we actually change some things to gain the information that shouldn’t be found. right click the browser page and click inspect.
Examples/Methods/Results
Checking changeable Tags
Some pages may have something disabled/hidden/password until some fields are filled. Here we try to inspect the page and change some html tags to enable the submit button without submit the rating. After the disable is changed to enable, it become possible to click submit.
Further Readings
Inspect Element: How to Temporarily Edit Any WebpageYoutube examples