HTML Block and Inline Elements
Every HTML element has a default display value depending on what type of element it is. The default display value for most elements is block or inline.
Block-level Elements
A block-level element always starts on a new line and takes up the full width available (stretches out to the left and right as far as it can).
<div> element is a block-level element.Example
<div>Hello</div>
<div>World</div>
Block level elements in HTML:
<address><article><aside><blockquote><canvas><dd><div><dl><dt><fieldset><figcaption><figure><footer><form><h1>-<h6><header><hr><li><main><nav><noscript><ol><output><p><pre><section><table><tfoot><ul><video>Inline Elements
An inline element does not start on a new line and only takes up as much width as necessary.
This is an inline <span> element
inside a paragraph.
Example
<span>Hello</span>
<span>World</span>
Inline elements in HTML:
<a><abbr><acronym><b><bdo><big><br><code><dfn><em><i><img><input><kbd><label><map><object><q><samp><script><select><small><span><strong><sub><sup><textarea><time><tt><var>The <div> Element
The <div> element is
often used as a container for other HTML elements.
The <div> element has no required attributes, but style, class and id are common.
When used together with CSS, the <div> element can be used to style blocks of
content:
Example
<div style="background-color:black;
color:white;
padding:20px;">
<h2>London</h2>
<p>London is the capital city of England. It is the most populous city in the United Kingdom, with a metropolitan area of over 13 million inhabitants.</p>
</div>
The <span> Element
The <span> element is
often used as a container for some text.
The <span> element has no required attributes, but style, class and id are common.
When used together with CSS, the <span> element can be used to style parts of the text:
Example
<h1>
My <span style="color:red">
Important
</span> Heading
</h1>