Online test 3 - Web Technologies

The tag in HTML is an empty element, meaning it doesn't require a closing tag and doesn't contain any content. It's a self-closing tag that defines an input field. Format tags like or have opening and closing tags, while empty tags like , , and
do not.

HTML documents must begin with the tag as the root element that contains all other elements. The

The element is specifically designed to establish the base URL for all relative URLs in a document. It's placed in the section and provides a single point of reference for resolving relative paths. The HEAD element contains metadata, main is for content, and is the correct semantic choice.

In image maps, any area of the image not explicitly defined as a hot zone (circle, rectangle, polygon, or point) automatically becomes part of the 'default' region. The default area acts as a catch-all for clicks that don't land on any defined hot zone.

Well-formed XML is defined by the XML 1.0 specification as meeting specific grammatical rules including proper nesting, matching tags, correct attribute syntax, and proper entity encoding. Option D correctly references the XML 1.0 specification. Well-formedness is purely syntactic and doesn't require DTDs or validation.

DOM (Document Object Model) is not event-driven - it loads and parses the entire XML document into a tree structure in memory, requiring more space than SAX. SAX (Simple API for XML) is event-driven and processes XML as a stream, using less memory. Option B correctly captures this key difference.

DTDs (Document Type Definitions) define templates for document structure but do not follow inheritance principles like XML Schema does. The option text has typos ('out does type' should be 'document type'), but the core concept is correct. DTDs are older and simpler than XML Schema, lacking features like inheritance and data types.

The
tag is an empty element in HTML that forces a line break without requiring a closing tag. It is self-closing and does not need a separate
tag. This makes it unique among HTML elements that are not container elements.

In HTML, attributes are always specified in the start tag (opening tag) of an element. End tags (closing tags) cannot contain attributes. This is a fundamental rule of HTML syntax - attributes like id, class, href, src always appear in the opening tag.

HTML tags typically come in pairs - an opening tag and a closing tag. For example,

...

and

are treated the same.

The server port number specifies which communication endpoint the web server is listening on. Common ports are 80 for HTTP and 443 for HTTPS. The domain name/IP identifies the computer, while the port identifies the specific service/process on that computer.

HTML is case-sensitive for element names - and represent completely different elements. They are not interchangeable. While some browsers may be lenient, the HTML specification treats them as distinct tags.