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Concept visual
Start from A
An HTML element is defined by a start tag, some content, and an end tag.
element is everything from the start tag to the end tag: < tagname > Content goes here... < /tagname >
< h1 > My
< /h1 > < p > My first paragraph. < /p >
<h1>
</h1> <p> My first paragraph. </p> <br> none none
Formula
Some HTML elements have no content (like the < br >element). These elements are called empty elements. Empty elements do not have an end tag!
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> ):
<!DOCTYPE html> <html> <body>
Formula
< h1 > My First Heading </h1 >
< p > My first paragraph.</p ></body> </html>
<html> element is the root element and it defines the whole HTML document.
<html> and an end tag </html>. Then, inside the <html> element there is a <body> element: <body>
Formula
< h1 > My First Heading </h1 >
< p > My first paragraph.</p ></body>
<body> element defines the document's body.
<body> and an end tag </body>. Then, inside the <body> element there are two other elements: <h1> and <p>
Formula
< h1 > My First Heading </h1 >
< p > My first paragraph.</p ><h1> element defines a heading.
<h1> and an end tag </h1>
Formula
< h1 > My First Heading </h1 ><p> element defines a paragraph.
<p> and an end tag </p>
Formula
< p > My first paragraph.</p >Some HTML elements will display correctly, even if you forget the end tag:
<html> <body>
Formula
< p > This is a paragraph
< p > This is a paragraph</body> </html> However, never rely on this! Unexpected results and errors may occur if you forget the end tag!
HTML elements with no content are called empty elements.