1.3.4 Web Technologies
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1.3.4 A) What is HTML
Script/language that web pages are written in. HTML allows a browser to interpret and render a webpage
1.3.4 A) How to open and close HTML tags
<tag> open </tag> close
1.3.4 A) What do the HTML code mean ? <html> <body> <link></link> <head> <title> <h1> , <h2> <p> </p></h2></h1></title></head></body></html>
1 ) all code in these tags is intrepreted by html 2) defines the content for main content 3) add links 4) defines brower tab or heading 5) defines text that appears in tab or heading 6)head style in v size 7)defines a para there will be space above and below
1.3.4 A) What do the HTML code mean ? <img></img> <a></a> <ol> / <ul> <div> </div></ul></ol>
1) self closing no need for </img>. <img></img> 2) hyper link <a> abc link </a> 3) order list is ol , underorder list ul, elements of list defined with <li> 4) divides page into seperate areas refered by unique name <div id = "page" >
1.3.4 A) What are classes and identifier in terms of webpages
attributes given to elements on a webpage which you wish to style
1.3.4 A) Whats the diff between class and identifiers
multiple elements across web pages can be assigned to a certain class can be defined within the head of the class or within css style sheet. class defined by full stops only one element can be associated with a particular indentifier defined w/ a hastag
1.3.4 A) What is CSS
cascading style sheet is a language used to describe the style of a webpage. CSS can be used to specify how elements work
1.3.4 A) What are the two types of css
Internal/embedded or external
1.3.4 A) what is Internal/embedded style sheet
placed inside the style tags and is directly entered directly into HTML doc
1.3.4 A) What is external style sheet How to link external
written in a seperate document and a link to this style sheet is added to HTML doc <link href =”nameofsheet.css” rel =”stylesheet” type =”text/css”
1.3.4 A) syntax for css
body { margine: 0px; padding: 0px; backround-color: white; font-family: x; font-size: 18px; text=align: centre; } Each sections of css begins with the name of the class/indentifier or elements to be styled follwed by curly brackets within which attributes of the elements are defined
1.3.4 B) What is a search engine
Program that searches through a database of internet addresses looking for resources based on criteria set by client .
1.3.4 B) What do search engines rely on
An index of webpages
1.3.4 B) How does search engine indexing work
Web crawlers are used to collect information about websites to build this index. They wrk by traversing the internet webpage by webpage using links on websites. Collect keywor and phrases and add this to index, Collect and add meta data
1.3.4 C) What is the purpose of a pagerank algorithm
Helps rank webpages determining the order which they are displayed. Higher rank shows first.
1.3.4 C) What factors determined rank
-How many incoming links from other webpages -Rank of webpahe that link to it.
1.3.4 C) What data structure is used to display Pagerank
Direted graph. SHows which pages link to other websites, Webpages are represented as nodes and links represented as arc.
1.3.4 C) What is the page rank algorithm
PageRank(x)=(1-d)+d[(pagerank(Ti)/count(Ti)] … +(pagerank(Ti)/countTN) PageRank(x) = the page rank of x count (tn) = total outbound links from wepage N d= dampening factor normally 0.15
1.3.4 C) Reality of using PRA
Modern use much more complex algorithms that take other factors like age of webpage and how quick it loads.
1.3.4 D) What is server side processing
Client sends data to a sever for it to be processed
1.3.4 D) Pros of server side processing
Doesnt require plugins large calc quick not browser dependat more secure
1.3.4 D) What is client side processing
Processing happens on local device aka client side scripting
1.3.4 D) pros of client side
webpages immedite response to user action executes quicker gives dev more control over look and behavior.