Block vs Inline display style in CSS

The 3 ways that HTML elements can be displayed

All HTML elements are naturally displayed in one of the following ways:

Block example

<p> tags and <div> tags are naturally displayed block-style.

(I say "naturally" because you can override the display style by setting the CSS display property e.g. display:inline;.)

A block-display element will span the full width of the space available to it, and so will start on a new line in the flow of HTML. The flow will continue on a new line after the block-display element.

Here I've started a paragraph and now I'm going to insert a <div>

and then continue the text here...

See how the <div> jumped in and took over the full width of the space?

Common HTML elements that are naturally block-display include:

<div>

Your general-purpose box

<h1> ... <h6>

All headings

<p>

Paragraph

<ul>, <ol>, <dl>

Lists (unordered, ordered and definition)

<li>, <dt>, <dd>

List items, definition list terms, and definition list definitions

<table>

Tables

<blockquote>

Like an indented paragraph, meant for quoting passages of text

<pre>

Indicates a block of preformatted code

<form>

An input form

Inline example

Inline-display elements don't break the flow. They just fit in with the flow of the document.

So here I've got a paragraph going on, and I'm going to add a <span> tag that has a yellow background and italic text. See how it just fits right in with the flow of the text?

More elements are naturally inline-style, including:

<span>

Your all-purpose inline element

<a>

Anchor, used for links (and also to mark specific targets on a page for direct linking)

<strong>

Used to make your content strong, displayed as bold in most browsers, replaces the narrower <b> (bold) tag

<em>

Adds emphasis, but less strong than <strong>. Usually displayed as italic text, and replaces the old <i> (italic) tag

<img />

Image

<br>

The line-break is an odd case, as it's an inline element that forces a new line. However, as the text carries on on the next line, it's not a block-level element.

<input>

Form input fields like and

<abbr>

Indicates an abbr. (hover to see how it works)

<acronym>

Working much like the abbreviation, but used for things like this TLA.

You change the display property of any elements

Although each HTML element has its natural display style, you can over-ride these in CSS.

This can be very useful when you want your page to look a particular way while using semantically-correct HTML.

Examples

Say you want to provide a list of items, but you don't want a big bulleted list. You just want to say that you're going to the store to buy:

• some fizzy drinks,
• a chainsaw,
• and some nylon stockings.

Or maybe you want a nice toolbar, which is stricly a list (of links) and so should be marked up as a <ul>.

Here's the code

Here's how it looks as a normal list

• Home
• About us
• Products
• FAQs
• Contact us

Just adding the class "toolbar"...

Here's how it looks with the CSS styles applied

• Home
• About us
• Products
• FAQs
• Contact us

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