How to Create a Website - Create-Website.org
There are many browsers available today (e.g. Chrome, Internet Explorer, Firefox, Safari). Because each browser (and version) can render web pages somewhat differently, it is important to anticipate which ones will be most frequently used by your visitors.
It is a good idea to test your website on the browsers and browser versions that you expect will most often access your site. This includes mobile browsers on both iOS and Android devices.
Once your website is constructed and in production, the web server log will reveal which web browsers are accessing your site.
In addition to optimizing for the most widely used browsers, it is also important to optimize for the most common screen resolutions (e.g. 800x600, 1024x768, 1280x600).