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16 Cards in this Set
- Front
- Back
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what is web-worker and why it is used? |
- HTML pages are unresponsive until excused scripts are finished. - JavaScript that runs in the background. - independent of other scripts -does not affect the performance of the page (you can still click on buttons and select while webworker is worker in the background) |
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what Is JQuery and why do we use it? |
-JQuery is a lightweight Java-script library. -it makes it much easier to use javascript on the website. -takes a lot of common tasks that require many lines of JavaScript code to accomplish,and wraps them into methods that you can call with a single line of code. |
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What is AJAX and Why do we Use it ? |
- AJAX = Asynchronous JavaScript and XML. - allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page. |
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Difference between Get and Post methods in forms ? |
-essentially GET is used to retrieve remote data, and POST is used to insert/update remote data. -post: sends form data as an HTTP post transaction - get: Default. Appends the form-data to the URL in name/value pairs: URL?name=value&name=value. |
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Difference between XML and JSON |
- Both JSON and XML are used to store and exchange data. - XML is a mark up language - JSON is object notation for example you can have arrays in JSON but not in XML |
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well formed |
to make it easy to explain, lets assume that the document is an XML document.. Well formed means that the XML document has correct syntax |
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Validated |
means the Xml document is well formed and complies with the rules stated in the DTD or schema. |
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WWW |
a space where documents and other resources are identified by URLs and interlinked and can be accessed via Internet. |
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what is DOM and what Is it used for? |
The Document Object Model (DOM) is a programming API for HTML and XML documents. It defines the logical structure of documents |
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DHTML? |
Dynamic HTML it includes HTML, javascript and CSS to create animated or interactive websites. |
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XHTML? |
is the same as HTML but stricter. html head title body are mandatory , and <body> are XHTML elements must be properly nested |
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why is it important to think about accessibility of web pages? |
"Worldwide, there are more than 750 million people with disabilities. As we move towards a highly connected world, it is critical that the Web be usable by anyone, regardless of individual capabilities and disabilities." tim-berners-lee |
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how may layers arethere of availability w3c standards and what is the highest level? |
- A AA AAA -higest level : AAA -so that isavailable for all browsers, and that it is clear, operable,understandable and robust. And it allows to use for people who have somedisabilities. |
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} Type of compressionGIF format? Maximum number of colors? What are the properties ofGIF89A? |
Gif is special for INTERNET and all browsers support this format lossless datacompression technique max is 8 bits 256colors good for logos and pictures which have less than 16 colors GIF89A : picturesfor pictures with transparent backgrounds, animated pictures |
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three ways how webapplication can save data on the local PC |
-Local storage -cookies -file API -offline cashing -indexed dB |
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why is manifest usedin web applications and what type of web applications uses it themost? |
-Used in off-linecashing applications -view the webpageoffline -more speed -server is notoverwhelmed. Manifest is textfile which makes it possible to work with applications online andaccording to that text file browser knows what files should be savedto cache or not. |
