Computing

Computing

1. HTML stands for Hyper Text Markup Language

2. HTML is the standard markup language for web pages.

   • People use HTML to create their own websites.
   • HTML describes the structure of a web page.

3. HTML consists of series of elements.

   • These elements tell the browser how to show the content.
   • Tags represent HTML elements.
     • Tags label pieces of content such as paragraphs and headings
     • Browsers don't show the tags but they do show the content of these tags.
     • HTML tags usually come in pairs.
       • e.g. <p> </p>
       • The first tag in the pair is called the start tag and the second is called the end tag.
       • The second tag has a forward slash in front of the tag name.
     • There are many tags.
       • <body> the body tag
         • <p> the paragraph tag
         • <h1> largest heading tag
           • <h6> smallest heading tag
   • A HTML element is everything from the start to the end tag.
   • All HTML elements can have attributes.
     • Attributes provide extra information about elements.

4. HTML Documents

   • HTML documents must start with <!DOCTYPE html>.
   • A HTML document begins with <html> and ends with </html>.
   • The part of the HTML document that we actually see is between <body> and </body>.
   • In HTML documents you can have headings. These are between <h1> </h1> or any other number up to 6.
   • Paragraphs are between <p> and </p>

5. HTML was created in the 1960s by Tim Berners-Lee

6. HTML is a special kind of XML.

   • XML stands for extensible markup language.

7. CSS stands for Cascading Style Sheets

   • CSS describes the style of a HTML document.
   • CSS describes how HTML elements should be displayed.
   • CSS saves a lot of work. It can control the layout of multiple web pages.
   • A CSS declaration starts and ends with curly braces.
     • There can be multiple declarations inside one set of curly braces and they are all separated by semi-colons and the declaration ends in a semi-colon.
     • {colour:blue; font-size:12px;}

8. Python

   • computing language
     • An algorithm is a set of tasks that help to create a bigger, more complex task
     • A variable is a reserved memory location to store values. It can only contain numbers, letters and underscores.
       • you should label a variable something simple and understandable so that anyone can understand it.
     • A string is a collection of characters
   • in a document put .py
     • this is so that the computer knows that this is a python document