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some devices may have constraints that cause a web site to run slowly, or display badly.

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If you need to support older browsers, you might have to not use those, or convert your code to old fashioned syntax using some kind of cross-compiler where needed. As an example, if you want to use cutting edge JavaScript features in your site, they might not work in older browsers. no more new work done on them) a long time before a new feature was even invented. This is inevitable when you are dealing with bleeding edge features that browsers are just getting round to implementing, or if you have to support really old browsers that are no longer being developed, which may have been frozen (i.e.

some browsers may have different levels of support for technology features than others.

Browsers are much better at following standards these days, but differences and bugs still creep through sometimes. This situation is a lot less bad than it used to be back when IE4 and Netscape 4 were competing to be the dominant browser in the 1990s, browser companies deliberately implemented things differently to each other to try to gain competitive advantage, which made life hell for developers.

sometimes browsers have bugs, or implement features differently.

Before you even get to cross browser issues, you should have already fixed out bugs in your code (see Debugging HTML, Debugging CSS, and What went wrong? Troubleshooting JavaScript from previous topics to refresh your memory if needed).Ĭross browser issues commonly occur because: There are many different reasons why cross browser issues occur, and note that here we are talking about issues where things behave different across different browsers / devices / browsing preferences. This is one of the great challenges of web development. As a web developer, you need to agree on a range of browsers and devices that the code definitely needs to work on with the site owner, but beyond that, you need to code defensively to give other browsers the best chance possible of being able to use your content.

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You can make some informed calls as to what browsers and devices your users will be using (as we'll discuss in the second article in the series - see Gotta test 'em all?), but you can't guarantee everything. Second, when we say 'across an acceptable number of web browsers', we don't mean 100% of the browsers in the world - this is just about impossible.

On the other hand, it is not OK for a site to work fine for sighted users, but be completely inaccessible for visually impaired users because their screen reader application can't read any of the information stored on it. As long as the site owner is happy with this, then you have done your job. On modern browsers you might get something animated, 3D and shiny, whereas on older browsers you might just get a flat graphic representing the same information. It is potentially OK for a site to not deliver the exact same experience on all browsers, as long as the core functionality is accessible in some way. To start with, when we talk about sites 'working cross browser', we are really saying that they should provide an acceptable user experience across different browsers. We should explain a few bits of terminology here. Note: Make the web work for everyone provides more useful perspective on the different browsers people use, their market share, and related cross browser compatibility issues.

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Remember that you are not your users - just because your site works on your MacBook Pro or high-end Galaxy Nexus, doesn't mean it will work for all your users - there's a whole lot of testing to be done! People with disabilities, who use the Web with the aid of assistive technologies like screenreaders, or don't use a mouse (some people use only the keyboard).Different devices with different capabilities, from the latest greatest tablets and smartphones, through smart TVs, right down to cheap tablets and even older feature phones that may run browsers with limited capabilities.Different browsers other than the one or two that you use regularly on your devices, including slightly older browsers that some people might still be using, which don't support all the latest, shiniest CSS and JavaScript features.As a web developer, it is your responsibility to make sure that not only do your projects work, but they work for all your users, no matter what browser, device, or additional assistive tools they are using. Cross browser testing is the practice of making sure that the web sites and web apps you create work across an acceptable number of web browsers.

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