Other than that, OmniWeb 4.2- is detectable as a layers browser with a significant difference from the others. I check if the navigator.accentColorName property exists - supported by OmniWeb but not HotJava - to distinguish between However, it can easily be mis detected as HotJava, so Omniweb 4.2- can spoof, and in fact allows users to input several navigator properties besides userAgent.įor this reason it must be detected before any userAgent detects. Uncatchable errors if checking for document.childNodes, so the check for Escape 5 must come before the check for KHTML/WebKit SavePreferences method of the navigator object, as well as both document.all and document.getElementById. HotJava must be discounted as a layers browser using its userAgent.Įscape 4 can spoof and identifies itself as Netscape 4, but has a few subtle differences, which I look for.Įscape/Evo 5 can spoof and identifies itself as MSIE 5 Mac, but it can be identified because it supports the ICab 3- can spoof, but always provides the ScriptEngine method that returns a string containing 'InScript'. ICEbrowser can spoof, but it always provides the _ice_version property. 'accentColorName' property of the navigator object. Is identical to Safari in every way (except its user agent, but that can spoof), except it also provides the Safari, as there may be lesser browsers that do not support document.all or navigator.taintEnabled. I also check for document.childNodes to make sure the browser is advanced enough to be (tainting was only supported in Netscape 3, but Gecko browsers still support the method, it just always returns false).Ĭhecking for the taintEnabled method causes errors in Internet Explorer (because it is stupid!) so the check forĭocument.all must be done first. (unlike its Konqueror 2 predecessor, and more importantly, Internet Explorer) or navigator.taintEnabled like Gecko There are subtle differences that makes Safari stand out from these other browsers. That it will then be identified as Konqueror (which it is anyway), Gecko or Internet Explorer by this script. WebKit Safari can spoof (using the debug add-ons) and becomes completely unidentifiable. For this reason, we must attempt to detect this before doing any userAgent detects. However, in spite of this, it always provides KHTML/WebKit Konqueror allows users to input any userAgent string they want. Whose userAgent header has been changed through the browser's menus, not, for example, changing the Windows registry. I look for other properties, often more uncommon ones, that the browsers provide. Sniffing should only be used to avoid browser specific bugs. This defies the purpose of spoofing, so use it wisely, and do not shut browsers out, just because you don't I have devoted much time to perfecting the browser sniffer to detect these browsers, even when they try to hide their In fact, even browsers like Internet Explorer allow you to change the userAgent header, if you are willing to To combat this, many minor browsersĪllow users to change the userAgent information (known as spoofing) to make these sites think they are a more popularīrowser. However, because many web developers use poor sniffing techniquesĪnd do not allow for all browsers, they often inadvertently shut minor browsers out. Not put the correct information in the other properties. Of all of these, the userAgent is the most reliable, as most browsers do Most browsers (all of the ones that I care about) provide properties of the window.navigator object that give theįull name of the browser and operating system. Or when you need to give specific information to users of specific browsers, like telling them how to change their These are usually when the support detect shows that a browser supports something, but in reality, it does not, Script test results What it is and how it worksĪlthough not a good technique, and far inferior to object detection, there are some times when it becomes necessary
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