What causes browser display differences?

Most of the time while browsing the same over many browsers you might have noticed considerable differences between the displays across the various browsers. These differences cause a lot of annoyance to the users.

There are various reasons why there occur differences across the different browsers. This article is focussed up on such browser display differences and errors as well as suggestions to avoid them.

ABOUT WEB BROWSER DISPLAY DIFFERENCES

- Earlier it was quite difficult and time consuming task to compare the web sites displays under many different browsers but nowadays several tools have been developed that have proven to be quite effective in testing the appearance of a web site on various browsers.

- These tools help in checking out the differences by taking the snap shots of the web site across the various browsers and then comparing them.

- You can even have the snap shots of your web page under different computers and screen resolutions.

- An HTML tool box is incorporated in these tools which tell whether the differences have occurred due to the incompatibility of the HTML code used in the web site or are they because of the browser incompatibility.

- The HTML tool box in some of the tools has also the capability for repairing off the code errors in just a few clicks.

Some of the most common factors that causes browser display differences are:
1. Browser bugs
2. Browser incompatibility
3. HTML errors
4. Different font sizes
5. Different computer types
6. Different screen sizes
7. Different versions of the browsers

RARE CASES
- In some very rare cases, the problem of differences might also occur due to certain features of a web site that have been exclusively designed for certain browsers and are not meant for others.

- Usually a web site is developed so that all of its features are accessible by all the web sites.

- For example, the web site for downloading Google chrome extensions and tools has been designed exclusively for the Google chrome browser.

- Though this web site can be viewed in any other browser but, one cannot download extensions through that browser.

STEPS FOR ELIMINATING DISPLAY DIFFERENCES ARE:

There are several steps that one can take for eliminating such differences:
1. Avoiding using cutting edge HTML as far as possible.
2. Set some goals for your web site.
3. Always check for the browsers incompatibilities.
4. Follow the trial and error debugging method.
5. Never forget to validate your web pages.

WHAT WEB BROWSERS ACTUALLY DO?

- They translate the web site code in to the formatted web pages.

- Every individual web browser has its own way of translating the web pages.

- This can be compared to the following example: you give a sentence written in German to a few people and ask them to translate it in to English. Checking the results, you will observe that all of them though have translated the sentence but their ways of translation are different i.e., the have used different words and grammar composition.

- Though the rules and standards for using HTML have been stated by the World Wide Web consortium, web site designers have their own way of implementing it.

- There is a fact that you should know which is that there is no such an effective browser that supports the hundred percent of the HTML, though there are certain browsers that come a little far away than their counterparts.

- If your browser does not supports a part of the code, it is sure to affect the display of your web site.

- This problem is further exaggerated by the HTML extensions that are specific to certain browsers.

- Such problems have forced the designers to put a label on their web site stating on which browser their web site can be viewed.

What we can do to avoid browser incompatibility?

Malfunctioning of the web sites across various browsers has become a topic of utter annoyance.

Why it happens so that your web site functions perfectly well on one browser and at the same time fails to perform well in some other browser?
Why it appears to be missing some thing while it appears as proper on other browsers?

The root cause of all such errors and differences is the browser incompatibility.

WHAT IS BROWSER INCOMPATIBILITY & TOOLS FOR DETECTING BROWSER INCOMPATIBILITY

- There are various tools that can help you across detecting the browser incompatibility.

- Such tools check for the browser incompatibility by comparing the various snap shots of the web site operating under various web browsers.

- Different browsers and different browser versions all add up to the browser incompatibility.

- Browser incompatibility though cannot be eradicated fully; it can be at least reduced to a certain extent.

- Though the browser is only to be blamed for its incompatibility, the measures to reduce or avoid it can be taken from both sides.

- It can be done by improving either the standards of the browser or by taking care of the web site.

- If the web site in its design and code is good, incompatibility will be noticed less.

WHY INCOMPATIBILITY ARISES?

- It arises either because of the incompatibility of the web browser or because of the problems in the web site itself.

- So you need to focus on the design an implementation of your web site rather than bogging up yourself with the browser issues.

- Employing cutting edge HTML can also run you in to the incompatibility problems as the HTML standards usually are a way step ahead of what is supported by the web browsers.

- Till now, no such browser has been developed that will take in to consideration 100 percent HTML.

- No doubt there are certain browsers that are a bit close to this value than the others.

- Using latest versions and standards of the HTML is always not a good choice. So be wise when you choose the version of HTML for designing up your web site.

- Another fact to be kept in mind is that not all the web browsers are equally efficient in translating the HTML code in to formatted web sites.

- There are some browsers that may leave certain parts of the HTML code because they are not able to execute it and again you will have trouble with your browser compatibility.

- Also all the web browsers do not translate a web page in the same manner and don’t give the same results.

- Before you start building up your web site, check out the compatibility of the different browsers so that you will have an idea what all formats and standards they support and you can build your site according and simultaneously avoiding a bug deal of incompatibility.

- After you have finished developing your web site, have your pages validated. If you are getting errors in your web site try out the trail and error debugging method.

Though the World Wide Web consortium has specified the standards for using HTML, you can very well invent your own and design your web site accordingly. But this has a disadvantage that the browser may reject the parts that cannot be executed and the appearance and functioning of your web site will be affected.

The basic difference between the two versions of a browser lies in the support they provide for the HTML. But on top of all it would be better if you pay attention to the browser compatibility while designing your web site. This will prevent you from running in to future issues regarding the incompatibility of the browser.

What are different compatibility and intersystem defects?

WHAT IS MEANT BY SOFTWARE COMPATIBILITY?

- Software compatibility is usually described as the compatibility of a software system or application to run without any problems on any major platform.
- It means that the software system or application is compatible with the major platforms and CPU architectures such as Intel or mercury etc.
- It also refers to the compatibility of a software system with different operating systems.
- It is very difficult to develop software that is compatible with many CPU architectures since during the compilation of such a system it shows different errors for the different CPU architectures.
- But such compatible application software do exist.
- The applications are developed and compiled for the various CPU architectures and these are then made compatible to with the various different CPU architectures via the operating systems.

WHAT IS INTERPRETED SOFTWARE?
- In contrast to the compiled software, the interpreted software does not show the above drawback.
- They are very well capable of running on multiple CPU architectures.
- But here one condition has to be fulfilled i.e., the interpreter should be available for that particular type of the CPU architecture.

Software incompatibility is more frequent among the newer software versions developed for the new versions of the operating system which is found to be incompatible with the older version of that software system or application version due to a lack of some features and functionalities.

The newer versions of a software system or application that are able to work with the older versions of the operating systems are said to possess the capability of the backward compatibility.

Compatibility testing is usually carried out to test the operational environment of a software application or program. The software system or application is checked for its suitability i.e., whether or not the application will be able to perform in that environment or not.

DIFFERENT COMPATIBILITY & INTER-SYSTEM DEFECTS
Defects affecting the compatibility of a software system or application are commonly called as compatibility and inter-system defects. These are:

DEFECT #1:
After completing the installation of the application software, the user executes that application and observes that he/she is not able to access some features and functionalities and also not able to view any pictures images, icons or data.

DEFECT #2:
Some browsers may show java script errors with applications developed in java language.

DEFECT #3:
Inconsistency is observed in some elements of a web application or a web site when viewed through different browsers.

DEFECT #4:
The software program is observed to behave differently on different browsers.

DEFECT #5:
Inter-system defects like corruption of data in an NFS mounted file. Usually data is not corrupted in an NFS system.

DEFECT #6:
- In some cases, an unauthorized user is very well able to access the control to a system which uses the LDAP methodology for the authentication purpose.
- This inter-system defect is common in ensemble, UNIX clients and VMS employing LDAP authentication system, windows clients and cache file versions.

DEFECT #7:
- Encryption of data base in VMS clusters.
- In such a defect the system usually becomes inactive and does not respond.
- Like the above mentioned defect, this defect also exists in ensemble versions. - This defect usually occurs when the data base is forced to shut down without the cache being closed.

DEFECT #8:
Failure of cluster mounted data bases.

DEFECT #9:
- Defect making the application server unresponsive.
- This defect is usually encountered when there is too much ECP traffic on the application or web site.
- This defect can affect all platforms.

DEFECT #10:
- Memory defects like core dumps which are generated during the start up of the cache.
- Because of this defect in some cases the start up can fail completely.

DEFECT #11:
Speed reduction in cache making it unresponsive. This defect occurs mainly when the amount of shared memory exceeds a specified limit.

How lack of compatibility causes software failure?

A software system or application is said to be compatible if it is able to execute efficiently on all the models available in that particular family of the gadget of computers. Different types of computers vary less or more in different aspects like reliability, resilience, performance and so on. These differences or variations affect the execution of the software system. Also the outcome or the result of the program is affected.

- Software compatibility can be defined as the compatibility that particular software system, application or program has when it runs on a particular CPU or central processing unit architecture.

For example, Intel, Pentium, power PC etc. software compatibility is not only confined to different kinds of computers.

- It extends over a vast area.
- Software compatibility can also be defined as the ability of a software system, application or program to run on different operating systems.
- It happens very rarely that a fully compiled software system or application is able to run on many different CPU architectures.
- Usually a software system or application is developed and compiled for various different CPU architectures as well as operating systems to allow the software system to be compatible with the different kinds of operating and CPU systems.
- In contrast to compiled software system or applications, interpreted software, can easily run on many different operating systems and CPU architectures.
- But, this can happen only if the interpreter is available for that particular CPU architecture or the operating system as the case may be.

Software incompatibility is quite common with fresh releases of any software system or application and generally occurs quite a many times for the new software system released for a newer version of CPU architecture or an operating system which is quite incompatible with the older version of that particular CPU architecture or operating system.


- This is because the software system or application might be lacking some of the features and functionalities required to make it compatible with the wanted CPU architecture or operating system.
- There’s another concept that comes into scenario of the compatibility of software called “backward compatibility”.
- The software systems and applications which are able to work with the older versions of CPU architecture or operating systems are said to be backward compatible.

Apart from software compatibility we also have hardware compatibility.
- It can be defined as the compatibility of the hardware components of a computer system which has a particular CPU architecture, operating system and other things like bus; mother board etc. compatible hardware doesn’t necessarily gives its optimum performance as stated.
Best example is given by RAM chips.

- Hardware can be compatible only with those operating systems for which kernel drivers and devices are available. For example, hardware components for Mac Os do not work with Linux operating system.
- Compatibility is essential and useful but it is very difficult to keep the extraneous features and functionalities with the software and the hardware system for a very long term and that too just for the sake of compatibility.

- Compatibility is the ability of the software system or device to work with another system or device.
- Compatibility is concerned with various degrees of partnership among the software and hardware components of a system.
- Two devices or programs are said to be compatible if they respond to the software and hardware commands exactly in the same way.
- Some components achieve compatibility by making the software system believe that they are some different machines.
- Such a process is called emulation. It’s important to note that the hardware compatibility not always considers expansion slots.