A LevelComputer ScienceOCRRevision Notes3. Exchanging Data3.4 Web TechnologiesHTML

HTML (OCR A Level Computer Science)

Revision Note

Jamie Wood

Written by: Jamie Wood

Reviewed by: James Woodhouse

Writing HTML

  • HTML, or HyperText Markup Language, is the foundational language used to structure content on the web

  • HTML consists of a series of elements, often referred to as "tags," which can be used to structure and format a webpage

  • The <html> tag is the root element of an HTML page. The tag includes all other HTML elements used on the page

  • Most tags are opened and closed e.g. <html> and </html> whereas some tags are only opened e.g. <img> and <link>

  • The content layer of a web page is made up of HTML elements such as headings (<h1>, <h2>, etc.), paragraphs (<p>), links (<a>), images (<img>), and more

Examiner Tips and Tricks

  • An exam question which asks you to write HTML is asking you to write code which is specifically HTML. This means all spelling and syntax MUST be correct for you to get the marks

The Head

  • The head section contains information about the web page that's not displayed on the page itself

    • The head section is enclosed by <head> and </head> Tags

    • Some of the content inside the head tag is shown in the browser tab

Page title

  • The <title> element is used to set the page title that shows in the browser tab

  • The crown is placed inside the <head> section of the HTML document

  • E.g.   <title>Sample Webpage</title>

External stylesheet

  • External stylesheets are linked in the <head> section using the <link> element

  • The rel the attribute is set to "stylesheet", and the href the attribute contains the relative file path to the CSS file

  • Stylesheets are loaded in the order they are listed, so hierarchy is important

  • E.g.   <link rel="stylesheet" type="text/css" href="styles.css">

The Body

  • The body section contains the main content of the web page, such as text, images, videos, hyperlinks, tables etc.

    • The body section is enclosed by <body> and </body> Tags

    • The content inside the body tag is displayed in the browser window

Headings

  • Headings help users understand how a page is organised and structured. They help guide the user's eye around the page and help them quickly find the information they're looking for

  • Headings are also important for users that use screen readers, such as visually-impaired users. Screen reader software uses headings to help the user navigate around the page (e.g. providing a list of all the headings on the page, and allowing the user to jump straight to a particular heading)

  • The tags used for headings are <h1>, <h2>,<h3> etc.

  • <h1> is the highest level heading, with <h2> and <h3> serving as subheadings 

  • The number in the tag denotes the level of the heading. Headings should be used hierarchically, with <h1> the most prominent, and <h6> the least prominent

  • Headings are also important for Search Engine Optimisation (SEO), as they help search engines like Google understand the content and structure of the page

E.g.

<h1>Welcome to My Sample Webpage</h1>

<h2>About This Page</h2>

Images

  • The <img> tag embeds an image into an HTML document

  • The img tag includes the src attribute which specifies the URL of the image (the source of the attribute), and the alt attribute which provides alternative text for screen readers or in cases where the image cannot be displayed. The tag also helps search engines understand the content of the image

  • The height and width attributes specify the dimensions of the image

  • E.g. <img src="https://cdn.savemyexams.com/logo/sme-logo-small.svg" alt="Save My Exams Image" height="100" width="200">

  • The <a> tag, or anchor tag, is used to create hyperlinks

  • The tag includes the href attribute which specifies the URL that the link points to

  • This can be included within another tag to specify the text which will be displayed

  • E.g. <p>Visit the <a href="https://www.savemyexams.co.uk">Save My Exams site</a> for more information.</p>

  • An image can also become a hyperlink

  • E.g. <a href=”https://www.savemyexams.co.uk”><img src=”logo.png”></a>

Div

  • The <div> tag is a generic container that can be used to group other HTML elements together

  • The div tag is often used in conjunction with CSS to style sections of a webpage

Form

  • The <form> tag is used to create a form for user input

Input

  • The <input> tag is used within a <form> tag to create interactive controls for web-based forms

  • The type attribute can be set to "text" to create a textbox, or "submit" to create a submit button

  • The name attribute is used to identify the input

  • E.g.

<form action="/submit" method="post">

<label for="age">Age:</label>

<input type="number" id="age" name="age" min="0">

<label for="email">Email:</label>

<input type="email" id="email" name="email">

<input type="submit" value="Submit">

</form>

Paragraph

  • The <p> tag is used for a paragraph of text

  • E.g.   <p>This is a sample webpage created to demonstrate the usage of various HTML tags.</p>

Lists

  • The <li> tag is used to define a list item

  • The <ol> and <ul> Tags are used to create ordered and unordered lists

    • An ordered list will look like numbered bullet points

    • An unordered list will look like normal bullet points

  • <li> tags are nested within these to show each item in the list

  • E.g.  

<ul>

    <li>html</li>

    <li>head</li>

    <li>title</li>

    <li>body</li>

    <li>h1, h2, h3</li>

    <li>p</li>

    <li>a</li>

    <li>img</li>

    <li>div</li>

    <li>form</li>

    <li>input</li>

    <li>script</li>

  </ul>

JavaScript

  • The <script> tag is used to embed or reference JavaScript code within an HTML document

  • E.g. <script src="script.js"></script>

Examiner Tips and Tricks

  • It's important to note that the correct usage of relative paths/URLs depends on the file structure and organisation of your web project. Carefully consider the relative relationship between files and directories to ensure accurate referencing of resources

Classes & Identifiers in HTML

  • Classes and identifiers (IDs) can be used to specify an HTML element

  • A class can have many HTML elements

  • An ID specifies a unique ID for an HTML element

  • Only 1 element can have the ID

  • A class or an ID can have specific styling applied to it in the CSS

  • E.g.

<body>

  <div id="header">

    <h1>Study Guide</h1>

  </div>

  <div class="subject" id="maths">

    <h2>Maths Revision</h2>

    <p>Key topics to revise are algebra, trigonometry, and statistics.</p>

  </div>

  <div class="subject" id="english">

    <h2>English Revision</h2>

    <p>Focus on improving your grammar, vocabulary, and essay writing skills.</p>

  </div>

  <div class="subject" id="science">

    <h2>Science Revision</h2>

    <p>Remember to revise the core concepts in physics, chemistry, and biology.</p>

  </div>

</body>

Styling is covered in more detail in CSS but here’s an example to illustrate the use of classes and IDs:

/* styles.css */

#header {

  background-color: lightblue;

  padding: 10px;

  text-align: center;

}

.subject {

  border: 1px solid black;

  margin: 10px;

  padding: 10px;

}

#maths {

  background-color: #FFDDDD;

}

#english {

  background-color: #DDFFDD;

}

#science {

  background-color: #DDDDFF;

}

Example Webpage in HTML

Here’s an example webpage and the HTML code written to create it:

Example webpage using the properties listed above

This is the code for this webpage:

<!DOCTYPE html>

<html>

<head>

  <title>Sample Webpage</title>

  <link rel="stylesheet" type="text/css" href="styles.css">

</head>

<body>

  <h1>Welcome to My Sample Webpage</h1>

  <h2>About This Page</h2>

  <p>This is a sample webpage created to demonstrate the usage of various HTML tags.</p>

  <h3>HTML Elements Used</h3>

  <ul>

    <li>html</li>

    <li>head</li>

    <li>title</li>

    <li>body</li>

    <li>h1, h2, h3</li>

    <li>p</li>

    <li>a</li>

    <li>img</li>

    <li>div</li>

    <li>form</li>

    <li>input</li>

    <li>script</li>

  </ul>

  <h2>Contact Us</h2>

  <form action="/submit_form" method="post">

    <div>

      <label for="name">Name:</label>

      <input type="text" id="name" name="name">

    </div>

    <div>

      <input type="submit" value="Submit">

    </div>

  </form>

  <h3>Image Example</h3>

  <img src="https://cdn.savemyexams.com/logo/sme-logo-small.svg" alt="Save My Exams Image" height="100" width="200">

  <h3>External Link</h3>

  <p>Visit the <a href="https://www.savemyexams.co.uk">Save My Exams site</a> for more information.</p>

</body>

<script src="script.js"></script>

</html>

Worked Example

One page in the website contains a hyperlink on an image. When the image stored as “ticket.png” is clicked, the user is hyperlinked to the page stored as “booking.htm”.

Write the HTML code to implement this hyperlink.

3 marks

How to answer this question:

You can use the example code from above to write the link:

 <a href=”https://www.savemyexams.co.uk”><img src=”logo.png”></a>

You’ll need to change the link to the one given in the question (booking.htm) and change the image name to the one given in the question too (ticket.png)

The marks are awarded for:

  • Correct <a> with closing </a>

  • href property to correct page

  • correct <img> tag with src property to correct file

Answer:

Example answer:

<a href=”booking.htm”><img src=”ticket.png”></a>

Examiner Tips and Tricks

  • When you’re given a link or filename in the question, make sure you copy it exactly as it appears. Your case (capital letters) and spelling need to be spot on to make sure you don’t drop marks! E.g. https://www.youtube.com/watch?v=fQBfpaiYlWg is not the same as https://www.youtube.com/watch?v=fqbfpaiyiwg 

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    Author
    Reviewer
    Jamie Wood

    Author: Jamie Wood

    Expertise: Maths

    Jamie graduated in 2014 from the University of Bristol with a degree in Electronic and Communications Engineering. He has worked as a teacher for 8 years, in secondary schools and in further education; teaching GCSE and A Level. He is passionate about helping students fulfil their potential through easy-to-use resources and high-quality questions and solutions.

    James Woodhouse

    Author: James Woodhouse

    Expertise: Computer Science

    James graduated from the University of Sunderland with a degree in ICT and Computing education. He has over 14 years of experience both teaching and leading in Computer Science, specialising in teaching GCSE and A-level. James has held various leadership roles, including Head of Computer Science and coordinator positions for Key Stage 3 and Key Stage 4. James has a keen interest in networking security and technologies aimed at preventing security breaches.