1.3.4 - Web Technologies Flashcards
(32 cards)
What information does a web crawler capture when it visits a site?
Records key information:
- Text
- Metatags
- Position of each word within the page
- Outbound Links
Follows links to other sites
How does a web crawler find a website?
What can a developer do stop a web crawler from indexing a site?
A site is found either by selecting it from an existing list or following a link from another site.
The robots.txt file can be used to instruct web crawlers to skip the page.
Where does the information go that was gathered by the web crawler?
- All information gathered is stored in an index
- Data is organised and interpreted by the search engine’s algorithm to measure its importance compared to similar pages.
- Servers based all around the world allow users to access pages from the index almost instantaneously.
- Users are not searching on the web, they are searching in the search provider’s index.
What is PageRank and what are the main factors taken into account to calculate the PageRank of a website?
PageRank is a calculation, which evaluates the quality and quantity of links to a webpage to determine a relative score of that page’s importance and authority on a 0 to 10 scale. Stored as a weighted, directed graph.
- The number of sites that link to the site
- The PageRank of the linking sites
- The number of outward links from the site
What is the PageRank damping factor?
A value between 0 and 1.
The probability that a user will not follow a link
How can a website improve its PageRank Score?
- Use meta tags (describes the content of the webpage)
- Use a lot of relevant keywords in the text of pages and in headings
- Increase the number of quality incoming links from sites with a higher rank than them
- Increase the number of outgoing links
What is the purpose of
HTML | CSS | JavaScript
- HTML - Used to define the content and structure of a web page. Uses tags.
- CSS - Sets the formatting of the website (colours, layout etc.) Enables a consistent look to every page as style sheet is shared.
- JavaScript - Adds the interactivity to pages. As well as validation on web forms
What three methods can be used to insert CSS into a webpage?
- Inline - CSS is added directly into the tag.
- Embedded – The CSS is added to the top of each HTML page.
- External – All the CSS is added to an external file and then linked to within each HTML page
List the 9 CSS formatting commands that you are expected to know.
- background-color
- border-color
- border-style
- border-width
- color (font)
- font-family
- font-size
- height
- width
How is a class identified in HTML and CSS?
How is an ID identified in HTML and CSS?
What is the purpose of the div tag?
To group a section of HTML code together so they can be referred to as one identifier.
What would be the HTML code to create a bullet point list with the values “Hello” and “World” in the list?
What would be the HTML code to create a numbered list with the values “Hello” and “World” in the list?
What HTML tags are used to embed JavaScript in an HTML page?
What HTML tags are used to embed CSS in an HTML page?
How would I add a link to the BBC home page using HTML code?
How would I add a 100x100 image called “smile.png” to an HTML page and set appropriate alternative text?
What is the HTML code to add a form to a page with a text box and a submit button?
What are the three largest headings in HTML?
What is the purpose of the title tag, and where does it appear?
This would appear in the tab name at the top of the web browser.
How do you get JavaScript to show an alert box?
alert(“Message to alert”)
How do you capture the input from a form textbox using JavaScript?
passcode = document.GetElementById(“nameOfID”).value
How do you update an element in an HTML element using JavaScript?
document.GetElementById(“nameOfID”).innerHTML = “Hello World”
