15 and up) even Opera is itself only a shell for Blink.īrowser = (/ucbrowser/i).test(userAgent) ? 'UCBrowser' : browser īrowser = (/edg/i).test(userAgent) ? 'Edge' : browser īrowser = (/googlebot/i).test(userAgent) ? 'GoogleBot' : browser īrowser = (/chromium/i).test(userAgent) ? 'Chromium' : browser īrowser = (/firefox|fxios/i).test(userAgent) & !(/seamonkey/i).test(userAgent) ? 'Firefox' : browser īrowser = (/ msie|trident/i).test(userAgent) & !(/ucbrowser/i).test(userAgent) ? 'IE' : browser īrowser = (/chrome|crios/i).test(userAgent) & !(/opr|opera|chromium|edg|ucbrowser|googlebot/i).test(userAgent) ? 'Chrome' : browser īrowser = (/safari/i).test(userAgent) & !(/chromium|edg|ucbrowser|chrome|crios|opr|opera|fxios|firefox/i).test(userAgent) ? 'Safari' : browser īrowser = (/opr|opera/i). The exception is Opera, which relies on user agent sniffing, but today (i.e. The beauty of this approach is that it relies on browser engine properties, so it covers even derivative browsers, such as Yandex or Vivaldi, which are practically compatible with the major browsers whose engines they use. IsBlink = (isChrome || isOpera) & !!window.CSS if (isChrome) alert('You are using Chrome') 5. var isSafari /Safari/.test(erAgent) & /Apple Computer/.test(navigator.vendor) 3. Var isSafari = /constructor/i.test(window.HTMLElement) || (function (p) )(!window || safari.pushNotification) It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company. var isChrome /Chrome/.test(erAgent) & /Google Inc/.test(navigator.vendor) 2. Var isFirefox = typeof InstallTrigger != 'undefined' If the feature exists then that functionality is allowed to run. That provides a set of variables that we can use to conditionally check for specific browsers and apply any desired code, for example: Repeat: use this technique with caution, browsers are constantly. The best way to decide which functionality to use is feature detection. Of course, there's always a chance that Chrome will have a quirk that none of the other browsers have and you may need to use client side detection to fix the problem. It cannot be done outside of a plugin.Var isOpera = (!!window.opr & !!opr.addons) || !!window.opera || (' OPR/') >= 0 Here is a JavaScript snippet to detect each of the major browsers, Chrome, IE, Firefox, Opera, and Safari.
Chrome and Firefox, in particular, expose internal API's which allow plugins to check if the user is in private browsing/incognito mode and action accordingly. My answer below does not work because it returns true for chrome as well. If it is required internally by a company, you should develop a browser plugin. The problem is that all chrome useragents return safari as the browser and do not contain the work chrome anywhere in the useragent. Other means of detecting private mode in Chrome specifically have been completely patched and will no longer work. If you are testing for localStorage support regardless of mode, it will always return true for browsers that support it. Once you're finished browsing, the namespace is erased and nothing is saved.
They simply namespace it in a temporary location to prevent websites that use it from erroring out. People are choosing to browse anonymously and or not anonymously for their own reasons.īrowsers like Chrome and Firefox do not disable functionality like localStorage any more.
There should never be a situation where needing to detect private browsing mode on a normal day-to-day website is ever needed. The ability to detect private browsing mode has been acknowledged as a bug and was never intended. So, if you're wanting to detect private browsing it's now impossible (unless you find a way to do it that Google hasn't found). Google is removing the ability to detect Private Browsing Mode permanently in Chrome 76 onwards. However, take into account what people from Chrome said, paraphrasing. Return new Promise ( function detect ( resolve ) If you want to run it in old browsers, polyfill it: * Lightweight script to detect whether the browser is running in Private mode.