This site allows you to check various parts of your computer, like your operating system or what OS you're using. For reference:

• isChrome: if this is true, you are using Chrome 1 or newer
• isMozilla: if this is true, you are using Firefox 1 or newer
• isSafari: if this is true, you are using Safari 3.0 or newer
• isOpera: if this is true, you are using Opera 8.0 or newer
• isBlink: if this is true, you are using some Blink-based browser
• isIE: if this is true, you are using Internet Explorer verions 6-11
• isEdge: if this is true, you are using Microsoft Edge 20 or newer