Web Technologies and Multimedia
Web Technologies and Multimedia tests HTML structure and tags, the client-server model of the web, and basic multimedia properties such as resolution and compression. Expect tag identification, attribute matching and small size calculations.
HTML basics
A document has a head for metadata and the title, and a body for visible content. Common tags: paragraph, headings h1 to h6, an anchor with an href attribute for links, an img tag with src and alt attributes, ul or ol with li for lists, and table with tr, th and td. The br and img tags are empty elements with no closing tag. CSS keeps presentation separate from structure.
Web model
A browser sends an HTTP request to a server, which returns a status code and a document. Static pages are stored as files; dynamic pages are generated per request, often with a database behind them. A URL contains a scheme, host, path and optional query string.
Multimedia
Raster images store a grid of pixels; vector images store geometric instructions and scale without blurring. Uncompressed bitmap size = width x height x colour depth / 8 bytes. JPEG is lossy; PNG and GIF are lossless, and GIF supports simple animation.
Worked example. A 1024 x 768 image at 24-bit colour: 1024 x 768 = 786,432 pixels; multiply by 3 bytes per pixel = 2,359,296 bytes, about 2.25 MiB uncompressed. Reasoning: 24 bits equals 3 bytes per pixel and no compression is applied in the raw calculation.
Traps. href belongs to links, src to embedded resources. Re-saving a JPEG degrades quality each time. Enlarging pixel dimensions does not add real detail.