HTML Documents
All HTML documents must start with a document type declaration: <!DOCTYPE
html>.
The HTML document itself begins with <html> and ends with </html>.
The visible part of the HTML document is between <body> and </body>.
The <!DOCTYPE> Declaration
The <!DOCTYPE> declaration represents the document type, and helps
browsers to display web pages correctly.
It must only appear once, at the top of the page (before any HTML tags).
The <!DOCTYPE> declaration is not case sensitive.
The <!DOCTYPE> declaration for HTML5 is:
<!DOCTYPE html>
HTML Headings
HTML headings are defined with the <h1> to <h6> tags.
<h1> defines the most important heading. <h6> defines the least important
heading:
Example
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
HTML Paragraphs
HTML paragraphs are defined with the <p> tag:
,Example
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
HTML Links
HTML links are defined with the <a> tag:
Example
<a href="https://www.glbim.org">This is a link</a>
The link's destination is specified in the href attribute.
Attributes are used to provide additional information about HTML elements.
HTML Images
HTML images are defined with the <img> tag.
The source file (src), alternative text (alt), width, and height are provided
as attributes:
Example
<img src="image1.jpg" alt="glbim.org" width="104" height="142">
HTML Elements
The HTML element is everything from the start tag to the end tag:
<tagname>Content goes here...</tagname>
Examples of some HTML elements:
<h1>My First Heading</h1>
<p>My first paragraph.</p>
,Start tag Element content End tag
<h1> My First Heading </h1>
<p> My first paragraph. </p>
<br> none none
Nested HTML Elements
HTML elements can be nested (this means that elements can contain other
elements).
All HTML documents consist of nested HTML elements.
The following example contains four HTML elements
(<html>, <body>, <h1> and <p>):
Example
<!DOCTYPE html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
Empty HTML Elements
HTML elements with no content are called empty elements.
All HTML documents must start with a document type declaration: <!DOCTYPE
html>.
The HTML document itself begins with <html> and ends with </html>.
The visible part of the HTML document is between <body> and </body>.
The <!DOCTYPE> Declaration
The <!DOCTYPE> declaration represents the document type, and helps
browsers to display web pages correctly.
It must only appear once, at the top of the page (before any HTML tags).
The <!DOCTYPE> declaration is not case sensitive.
The <!DOCTYPE> declaration for HTML5 is:
<!DOCTYPE html>
HTML Headings
HTML headings are defined with the <h1> to <h6> tags.
<h1> defines the most important heading. <h6> defines the least important
heading:
Example
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
HTML Paragraphs
HTML paragraphs are defined with the <p> tag:
,Example
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
HTML Links
HTML links are defined with the <a> tag:
Example
<a href="https://www.glbim.org">This is a link</a>
The link's destination is specified in the href attribute.
Attributes are used to provide additional information about HTML elements.
HTML Images
HTML images are defined with the <img> tag.
The source file (src), alternative text (alt), width, and height are provided
as attributes:
Example
<img src="image1.jpg" alt="glbim.org" width="104" height="142">
HTML Elements
The HTML element is everything from the start tag to the end tag:
<tagname>Content goes here...</tagname>
Examples of some HTML elements:
<h1>My First Heading</h1>
<p>My first paragraph.</p>
,Start tag Element content End tag
<h1> My First Heading </h1>
<p> My first paragraph. </p>
<br> none none
Nested HTML Elements
HTML elements can be nested (this means that elements can contain other
elements).
All HTML documents consist of nested HTML elements.
The following example contains four HTML elements
(<html>, <body>, <h1> and <p>):
Example
<!DOCTYPE html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
Empty HTML Elements
HTML elements with no content are called empty elements.
