aEngineering notes from A2Z Tools (https://a2z.tools), a library of 1,000+ free online tools. How we build browser-only developer tools with JavaScript and ASP.NET Core.
"Keyboard test online" gets searched by people with a sticky key, a second-hand laptop, or a new mechanical board to check. A web page is a good tool for this: no install, and every key you press ligh
"Water in phone speaker" is one of those searches that spikes every summer. The usual fix people find is a page or app that plays a low tone to push the water out. I built one, a speaker cleaner, and
If your page lets people type a regular expression and run it, one bad pattern can lock the whole tab. JavaScript's RegExp engine backtracks, so a pattern like this one /^(a+)+$/ against "aaaaaaaaaaa
