Difference in Tags:
<!DOCTYPE html> : In HTML 4.01, there are three different <!DOCTYPE> declarations but In HTML 5 there is only one <! DOCTYPE html>
<a >: In HTML 4.01, the <a> tag could be either a hyperlink or an anchor. In HTML5, the <a> tag is always a hyperlink, but if it has no href attribute, it is only a placeholder for a hyperlink.
<acronym> : The <acronym> tag is not supported in HTML5. Use the <abbr> tag instead. The <acronym> tag was used to define acronyms in HTML 4.01.
<applet>: The <applet> tag is not supported in HTML5. Use the <object> tag instead.
<strong>: In HTML 4.01, the <strong> tag defines strong emphasized text, but in HTML5 it defines important text.
<body> : In HTML5, all <body> specific attributes are removed, while in HTML 4.01 they were deprecated.
<hr>: In HTML 4.01, the <hr> tag represented a horizontal rule. In HTML5, the <hr> tag defines a thematic break. The <hr> element is used to separate content (or define a change) in an HTML page.
<map> : In HTML5, if the id attribute of the <map> tag is also specified, it must have the same value as the name attribute.
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HTML5 has a new attribute, charset, which makes it easier to define charset:
HTML 4.01: <Meta http-equiv="content-type" content="text/html; charset=UTF-8">
HTML5 : <meta charset="UTF-8”>
<script> : The "type" attribute is required in HTML 4, but optional in HTML5.
<small > : In HTML 4.01 the small element is displayed as smaller text. In HTML5 the small element defines small text and other side comments, and is displayed as smaller text.
<table>: Only the "border" attribute is supported in HTML5, and it only allows the values " " or "1".
New Semantic/Structural Elements:
HTML5 offers new elements for better structure:
<article> : Defines an article
<aside> : Defines content aside from the page content
<bdi> : Isolates a part of text that might be formatted in a different
direction from other text outside it
<command> : Defines a command button that a user can invoke
<details> : Defines additional details that the user can view or hide
<summary> : Defines a visible heading for a <details> element
<figure> : Specifies self-contained content, like illustrations, diagrams, photos, code listings, etc.
<figcaption> : Defines a caption for a <figure> element
<footer> : Defines a footer for a document or section.
<header> : Defines a header for a document or section
<hgroup> : Groups a set of <h1> to <h6> elements when a heading has multiple levels.
<mark> : Defines marked/highlighted text.
<meter> : Defines a scalar measurement within a known range (a gauge).
<nav> : Defines navigation links.
<progress> : Represents the progress of a task.
<ruby> : Defines a ruby annotation (for East Asian typography).
<rt> : Defines an explanation/pronunciation of characters (for East Asian typography).
<rp> : Defines what to show in browsers that do not support ruby annotations
<section> : Defines a section in a document
<time> : Defines a date/time
<wbr> : Defines a possible line-break .
New Media Elements :
HTML5 offers new elements for media content:
<audio> : Defines sound content.
<video> : Defines a video or movie.
<source> : Defines multiple media resources for <video> and <audio>.
<embed> : Defines a container for an external application or interactive content (a plug-in).
<track> : Defines text tracks for <video> and <audio>.
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