1.3.4 Web Technologies Flashcards
What does HTML do?
It allows a browser to render a webpage for the viewer, by describing the structure and order of the web page.
How is a class defined within CSS?
Using a dot.
.example {
background-color: green;
}
How is a defined class used within HTML?
<div>
<p> contents go here </p>
</div>
What is website meta data?
Information specified by website owner.
What does CSS do?
Describes the style of a web page.
What is javascript?
A scripting language which adds interactivity to websites.
What is javascript commonly used to do?
Validate input data on the client computer
Javascript Advantages
- Local computer can deal with invalid data, before it is sent to servers
- Eases the load on busy servers
- Reduces web traffic.
What is a search engine?
A program that searches through a database of internet addresses, looking for resources based on criteria set by the client.
What do search engines rely on?
An index of websites.
How do search engines build an index of websites?
They use web crawlers (spiders).
How do web crawlers work?
They traverse the internet page by page, using links on websites.
They collect keywords, phrases and metadata to add to the index.
How is an identifier defined within CSS?
example {
Using a hashtag.
background-color: green; }
What does the PageRank algorithm do?
It determines the order in which web pages are displayed when a search is conducted.
What two factors determine the page rank of a page?
- number of inbound links
- Page rank of inbound links
