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Web Development

Terms in this set (30)

199 - Testing Media
Testing the playback of media such as video and audio is necessary. Do media files play as expected? Do the controls work? If auto play is activated, do the media play upon page loading? Do images load properly and if not, does alt text appear in their place?
200 - Fitness for Purpose
(Web Design)
A website is fit for purpose if it fully meets the end user and functional requirements that were agreed at the analysis phase.
198 - Testing User Interface Consistency
Most websites make use of a consistent theme across pages. Is there evidence of consistency e.g.
consistent use of fonts, font size, text colours and the position of multimedia are usually considered when testing a site for consistency.
197 - Testing User Interface Design
Examine the interface against the wireframe plan and agreed low fidelity prototype. If the interface matches the design, testing is complete. Also take account of any accessibility features such as zoom or text to speech add-ons.
196 - Testing Navigation
Any hyperlinks, whether internal or external need to be tested. Any hotspots or image links should also be tested.
134 - navigation Structure
Navigation structure is either linear or hierarchical

Linear - Pages are accessed one after the other in order

Hierarchical _ There is a homepage and then sublevels containing additional pages
133 - Functional requirements (Web design)
Functional requirements relate to the processes that websites must be able to carry out, and any interaction with databases e.g

Javascript used to create interactive elements

Ability to generate queries on the client that will run server side.
135 - Wireframes
Wireframes are used to plan they layout of a webpage and should include:
.....Navigation Links
.....Text areas
.....Media (including file names and format)
.....Position and type of hyperlink
They may also include notes/annotation
136 - Wireframe Example
...
137 -Low Fidelity Prototype
Low fidelity prototypes are used to show the potential final user interface to the client. They are created using pen and paper and are often large drawings that include specific detail unique to the site. Clients/End users can then provide feedback before implementation.
138 - Copyright, Designs and Patents Act (1998)
The Copyright, Designs and Patents Act (1998) protects those who develop text, graphics, video and audio from having their work used without permission. If using any of the above on a website, it is necessary to seek the permission of the copyright holder.
139 - Compression
Compressing files means to reduce their file size. There are two reasons that compression is desirable:
• Lower file size requires less backing storage space
• Lower file size takes less time to transfer over a network
140 - Lossy Compression
Lossy compression reduces the size of a file by removing some of the original data/detail. Usually offers a better compression rate than lossless.
141 - Lossless Compression
Lossless compression reduces the size of a file without removing any of the original data. The way that the data is saved is usually altered to achieve compression. Does not usually achieve the same amount of compression as lossy but will not remove any of the original data.
142 - WAV Sound Files
WAV is a sound file format that is almost always uncompressed. Quality is consistent with the original sound. Restricted to no more than 4GiB in size and sampled at between 44KHz and 48KHz.
143 - MP3 Sound Files
MP3 is a sound file format that is compressed using perceptual encoding (a type of lossy compression). The level of compression can be altered, and this will dictate the overall quality of the sound. No size limit and sampled at between 44.1KHz and 48KHz.
144 _ JPEG Graphic Files
JPEG is a file format used to store graphics. JPEG files are compressed using a lossy technique called DCT encoding. They do not support animation or transparency. JPEG supports 16,777,216 colours (bit depth of 24 bits per pixel).
145 - PNG Graphic Files
PNG is a file format used to store graphics. PNG files use a lossless compression technique called DEFLATE. Animation is not supported but transparency is. PNG supports 16,777,216 colours (bit depth of 24 bits per pixel).
146 - GIF Graphic Files
GIF is a file format used to store graphics. GIF files use a lossless compression technique called LZW.
GIF supports animation (animated GIF) and transparency. GIF supports 256 colours (bit depth of 8 bits per pixel).
174 - Hyperlink
Hyperlinks can be added as follows:
<a href=www.google.com>Google</a>
The href attribute contains the URL of the link and the text between the tags is what you see on the page. In the above example, a user would see the word 'Google'. If they click on Google, they are taken to www.google.com
185 - Internal Hyperlink
Internal hyperlinks take the site user to another page within the same website. For example, if you are on the BBC News page and click on the sport link, you will be taken to a new page that is still part of the BBC site.
186 - External Hyperlink
External hyperlinks link to another website. When you click on an external link, you leave the site you are on to go to another website.
187 - Relative Hyperlink
If the HTML webpage files for a site are stored in the same folder, you can link to them using a relative hyperlink. A relative hyperlink does not need the full URL link as long as the linked page is held in the same folder directory.
188 - Absolute Hyperlink
Absolute hyperlinks are links that contain the complete URL for a page or site that you are linking to. The full file path is needed for the link to work.
8 - Bit Mapped Graphics
Bit Mapped graphics are made up of a 2D array of pixels. Every single pixel is saved. JPEG, PNG and GIF are bit mapped graphic formats.
9 - Bit Depth
Every pixel is stored as a binary code. Bit depth is the number of bits used to store each pixel. A bit depth of 8 bits allows the pixel to be one of 256 colours, a bit depth of 16 bits allows for 65,536 colours and a bit depth of 24bits allows for 16, 777, 216 colours. The higher the bit depth the larger the file size but the more colour available.
10 - Resolution
Resolution is the total number of pixels in an image.
E.g. A resolution of 800 x 600 would create 480,000
pixels
11 - Vector Graphics
Vector graphics are NOT stored as individual pixels. Instead a description of attributes is used to create an object/shape. E.g. for a circle the attributes might be: cx (centre x), cy (centre y), rx (radius x), ry (radius y), fill, line. The computer uses the attributes to create shapes.

Vector graphics usually have smaller file sizes than bit mapped graphics as you don't need to store every pixel.
12 - Bit Mapped v Vector
Scaling - Bit Mapped could be pixelated, vector would retain quality
Editing - Every pixel can be edited for fine detail in bit mapped graphics, in vector, fine detail is harder to edit as you can only change individual attributes
Layering - Bit maps don't let you layer shapes, whereas vectors do
File Size - bit mapped usually larger as every pixel is stored, whereas only attributes are stored in vector
200 - Fit for Purpose
A website is fit for purpose once it meets all functional and end user requirements established at the analysis phase.
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