{"id":95,"date":"2020-11-09T06:01:45","date_gmt":"2020-11-09T06:01:45","guid":{"rendered":"http:\/\/learnlearn.uk\/igcsecs\/?page_id=95"},"modified":"2022-01-28T04:48:28","modified_gmt":"2022-01-28T04:48:28","slug":"http-html-css","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/igcsecs\/http-html-css\/","title":{"rendered":"HTTP, HTML &#038; CSS Protocols"},"content":{"rendered":"<div class=\"responsive-tabs\">\n<h2 class=\"tabtitle\">HTTP(S)<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Hyper Text Transfer Protocol (Secure)<\/h3>\n<p>The internet is a global network of interconnected computers. Only a small proportion of the data which is sent through the internet is web page data, or Hypertext. Examples of the different data which is sent across the internet incluldes:<\/p>\n<ul>\n<li>Wep page data (HTML, CSS, Javascript)<\/li>\n<li>Images<\/li>\n<li>Video<\/li>\n<li>Sound<\/li>\n<li>Network maintenance data<\/li>\n<\/ul>\n<p>When a computer receives data it needs to know how to handle that data and the only way this can work on a global distributed network is if data is packaged and sent in an agreed format, or protocol. When HTML data is sent across the internet it is structured following the HTTP or HTTPS protocols. This tells your browser that it is a webpage that for your computer to display.<\/p>\n<p>When the internet was first invented it was mostly an academic tool for information only. Data was sent across the internet unencrypted and anyone with the right knowledge and tools could potentially snoop on your data. With the rise of internet shopping, social media and online storage of private data, it became imperative that data sent between web servers and users&#8217; computers needed to be secured.<\/p>\n<p>This led to the development of HHTPS protocol together with other technologies enabled end-to-end encryption of all data transferred across the internet. These days almost every website uses HTTPS instead of HTTP and if you do access a site this is not using HTTPS your computer will give you a warning not to put in any sensitive information into the site.<\/p>\n<div id=\"attachment_944\" style=\"width: 738px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/commons.m.wikimedia.org\/wiki\/File:Message_-_Copy.jpg\"><img aria-describedby=\"caption-attachment-944\" decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-944\" src=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/not-private-igcse-html.jpg\" alt=\"\" width=\"728\" height=\"600\" srcset=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/not-private-igcse-html.jpg 728w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/not-private-igcse-html-300x247.jpg 300w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/a><p id=\"caption-attachment-944\" class=\"wp-caption-text\">Connection not private warning. Source: Wikimedia<\/p><\/div>\n\n<\/div><h2 class=\"tabtitle\">HTML<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Hyper Text Markup Language<\/h3>\n<p>HTML is the language that allows web page creators to <strong>structure the content <\/strong>of their web pages. Without it web pages would be pretty boring, because they could only contain unformatted text. HTML defines how to add other visible and non-visible elements to a web page and how the overall document is to be structured<\/p>\n<h4>HTML Code Example<\/h4>\n<p><!-- HTML generated using hilite.me --><\/p>\n<div style=\"background: #ffffff; overflow: auto; width: auto; border: solid gray; border-width: .1em .1em .1em .8em; padding: .2em .6em;\">\n<pre style=\"margin: 0; line-height: 125%;\"><span style=\"color: #0000ff;\">&lt;!DOCTYPE html&gt;<\/span>\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h2&gt;My First HTML Page&lt;\/h2&gt;\r\n&lt;p&gt;Welcome to my website&lt;\/p&gt;\r\n\r\n&lt;img src=<span style=\"color: #a31515;\">\"cat.jpg\"<\/span> alt=<span style=\"color: #a31515;\">\"a cat\"<\/span> width=<span style=\"color: #a31515;\">\"300\"<\/span> height=<span style=\"color: #a31515;\">\"200\"<\/span>&gt;\r\n&lt;h3&gt;Todo List&lt;\/h3&gt;\r\n&lt;ol&gt;\r\n\t&lt;li&gt;Eat chocolate&lt;\/li&gt;\r\n\t&lt;li&gt;Watch YouTube cat videos&lt;\/li&gt;\r\n\t&lt;li&gt;Finish this page about html&lt;\/li&gt;\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;\r\n<\/pre>\n<\/div>\n<h3>Page Output<\/h3>\n<div id=\"attachment_935\" style=\"width: 413px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-935\" decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-935\" src=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/first-web-page-example.png\" alt=\"\" width=\"403\" height=\"538\" srcset=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/first-web-page-example.png 403w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/first-web-page-example-225x300.png 225w\" sizes=\"(max-width: 403px) 100vw, 403px\" \/><p id=\"caption-attachment-935\" class=\"wp-caption-text\">Here is what the code above displays.<\/p><\/div>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">CSS<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Cascading Style Sheets<\/h3>\n<p>When the World Wide Web was first invented, it was mostly just used for sharing and displaying academic work.\u00a0 The document structure language HTML was sufficient for the task, but the sites weren&#8217;t very pretty. What was needed was another language that could alter the presentation of the web page to make it prettier, and so CSS was developed.<\/p>\n<p>CSS allows web page creators to alter the look of a page by adding style information to a page&#8217;s content.<\/p>\n<h4>HTML &amp; CSS Code Example<br \/>\n<!-- HTML generated using hilite.me --><\/h4>\n<div style=\"background: #ffffff; overflow: auto; width: auto; border: solid gray; border-width: .1em .1em .1em .8em; padding: .2em .6em;\">\n<pre style=\"margin: 0; line-height: 125%;\"><span style=\"color: #557799;\">&lt;!DOCTYPE html&gt;<\/span>\r\n<span style=\"color: #007700;\">&lt;html&gt;<\/span>\r\n<span style=\"color: #007700;\">&lt;body<\/span> <span style=\"color: #0000cc;\">style=<\/span><span style=\"background-color: #fff0f0;\">\"background-color:lightyellow\"<\/span><span style=\"color: #007700;\">&gt;<\/span>\r\n\r\n<span style=\"color: #007700;\">&lt;h2<\/span> <span style=\"color: #0000cc;\">style =<\/span><span style=\"background-color: #fff0f0;\">\"font-size:50px;font-family:Arial\"<\/span><span style=\"color: #007700;\">&gt;<\/span>My First HTML Page<span style=\"color: #007700;\">&lt;\/h2&gt;<\/span>\r\n<span style=\"color: #007700;\">&lt;p&gt;<\/span>Welcome to my website<span style=\"color: #007700;\">&lt;\/p&gt;<\/span>\r\n\r\n<span style=\"color: #007700;\">&lt;img<\/span> <span style=\"color: #0000cc;\">src=<\/span><span style=\"background-color: #fff0f0;\">\"cat.jpg\"<\/span> <span style=\"color: #0000cc;\">style =<\/span><span style=\"background-color: #fff0f0;\">\"border:10px solid grey;\"<\/span>  <span style=\"color: #0000cc;\">width=<\/span><span style=\"background-color: #fff0f0;\">\"300\"<\/span><span style=\"color: #007700;\">&gt;<\/span>\r\n<span style=\"color: #007700;\">&lt;h3&gt;<\/span>Todo List<span style=\"color: #007700;\">&lt;\/h3&gt;<\/span>\r\n<span style=\"color: #007700;\">&lt;ol<\/span> <span style=\"color: #0000cc;\">style =<\/span><span style=\"background-color: #fff0f0;\">\"color:blue\"<\/span><span style=\"color: #007700;\">&gt;<\/span>\r\n\t<span style=\"color: #007700;\">&lt;li&gt;<\/span>Eat chocolate<span style=\"color: #007700;\">&lt;\/li&gt;<\/span>\r\n\t<span style=\"color: #007700;\">&lt;li&gt;<\/span>Watch YouTube cat videos<span style=\"color: #007700;\">&lt;\/li&gt;<\/span>\r\n\t<span style=\"color: #007700;\">&lt;li&gt;<\/span>Finish this page about html<span style=\"color: #007700;\">&lt;\/li&gt;<\/span>\r\n<span style=\"color: #007700;\">&lt;\/body&gt;<\/span>\r\n<span style=\"color: #007700;\">&lt;\/html&gt;<\/span>\r\n<\/pre>\n<\/div>\n<h3>Page Output<\/h3>\n<div id=\"attachment_936\" style=\"width: 632px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-936\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-936 size-full\" src=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/page-example-2.png\" alt=\"\" width=\"622\" height=\"670\" srcset=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/page-example-2.png 622w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/page-example-2-279x300.png 279w\" sizes=\"(max-width: 622px) 100vw, 622px\" \/><p id=\"caption-attachment-936\" class=\"wp-caption-text\">CSS Changes the document&#8217;s presentation (how it looks)<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">Cookies<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Cookies<\/h3>\n<p>As web pages grew in complexity and scope it became clear that website owners needed a way to store information on the user&#8217;s computer about their browsing. Originally this data was mostly used to store information about whether a user had visited the site before, whether or not they were logged in whether they have selected a preferred language etc. In order to store this data web browsers added functionality where small files were stored in the browser cache on the user&#8217;s machine &#8211; called Cookies.<\/p>\n<p>This was all fine until advertisers realised that they could use these cookies to track a user&#8217;s browsing habits across the internet, through the use of third party cookies. This meant that if you searched up for a new holiday or browsed a clothes shopping site then advertisers could then tailor the advertisements they show to you in order to get a higher sales conversion rate.<\/p>\n<p>This led to huge privacy concerns and now websites need to get your permission before storing cookies on your machine.<\/p>\n<div id=\"attachment_937\" style=\"width: 899px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-937\" decoding=\"async\" loading=\"lazy\" class=\" wp-image-937\" src=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/cookies.png\" alt=\"\" width=\"889\" height=\"144\" srcset=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/cookies.png 938w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/cookies-300x49.png 300w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/cookies-768x124.png 768w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2020\/11\/cookies-930x152.png 930w\" sizes=\"(max-width: 889px) 100vw, 889px\" \/><p id=\"caption-attachment-937\" class=\"wp-caption-text\">I used to chrome developer tools to see what cookies were on my machine.<\/p><\/div>\n<p><strong>Activity &#8211; Try it yourself!<\/strong><\/p>\n<ol>\n<li>On chrome go to\u00a0 Settings (three dots) &gt; More Tools &gt; Developer Tools<\/li>\n<li>When the developer pane pops up go to\u00a0 Application &gt; Cookies<\/li>\n<li>Take a look at all the cookies!<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">Resources<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Resources<\/h3>\n<p><strong>Past Paper Exam Questions<\/strong><\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/viewer\/caie\/cambridge-upper-secondary-igcse-computer-science-0478-2016-jun-0478-s16-qp-12-pdf\">0478\/12 &#8211; Paper 1 Theory May\/June 2016 Qn 11<\/a><\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/viewer\/caie\/cambridge-upper-secondary-igcse-computer-science-0478-2016-nov-0478-w16-qp-12-pdf\">0478\/12 &#8211; Paper 1 Theory October\/November 2016 Qn10<\/a><\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/viewer\/caie\/cambridge-upper-secondary-igcse-computer-science-0478-2017-mar-0478-m17-qp-12-pdf\">0478\/12 &#8211; Paper 1 Theory February\/March 2017<\/a>\u00a0Qn5<\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/viewer\/caie\/cambridge-upper-secondary-igcse-computer-science-0478-2017-nov-0478-w17-qp-12-pdf\">0478\/12 &#8211; Paper 1 Theory October\/November 2017 Qn5 &#8211; Cookes<\/a><\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/viewer\/caie\/cambridge-upper-secondary-igcse-computer-science-0478-2018-may-june-0478-s18-qp-11-pdf\">0478\/11 &#8211; Paper 1 Theory May\/June 2018\u00a0 Qn1<\/a>0c Cookies<\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/viewer\/caie\/cambridge-upper-secondary-igcse-computer-science-0478-2018-oct-nov-0478-w18-qp-12-pdf\">0478\/12 &#8211; Paper 1 Theory October\/November 2018 qn 7 (easy starter of review)<\/a><\/p>\n<p>&nbsp;<\/p>\n<\/div><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hyper Text Transfer Protocol (Secure) The internet is a global network of interconnected computers. Only a small proportion of the data which is sent through the internet is web page data, or Hypertext. Examples of the different data which is sent across the internet incluldes: Wep page data (HTML, CSS, Javascript) Images Video Sound Network&hellip;&nbsp;<a href=\"https:\/\/learnlearn.uk\/igcsecs\/http-html-css\/\" class=\"\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">HTTP, HTML &#038; CSS Protocols<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HTTP, HTML &amp; CSS Protocols | IGCSE Computer Science | Learnlearn.uk<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnlearn.uk\/igcsecs\/http-html-css\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HTTP, HTML &amp; CSS Protocols | IGCSE Computer Science | Learnlearn.uk\" \/>\n<meta property=\"og:description\" content=\"Hyper Text Transfer Protocol (Secure) The internet is a global network of interconnected computers. 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