A web-based stopwatch and timer application written in HTML5, CSS, and JavaScript. You can run the application on GitHub Pages HERE! You can also run the application by cloning this repository on your computer and opening the index.html file in a web browser.
There are two problems that may be faced when developing a stopwatch/timer. The first is that the numbers displayed on the screen may shake horizontally as they increase/decrease due to the display repeatedly switching from wider to thinner characters. This application overcomes that problem by using a monospaced font, which is a font whose characters all have equal widths. The second problem is that the time measured by the stopwatch/timer may deviate from the true time after a while if it repeatedly increments/decrements time without verifying the system time. This may happen because there may be a delay between each successive incrementation/decrementation of time causing the frequency in which time is incremented/decremented to be non-constant and different from what it is expected to be. To solve that problem, this application measures time by comparing the system time to the time when the stopwatch/timer was last started, as opposed to simply incrementing/decrementing the time repeatedly.
This repository is released under the MIT License (see LICENSE).