HTML Attributes

HTML Attributes

  • All HTML elements can have attributes
  • Attributes provide additional information about an element
  • Attributes are always specified in the start tag
  • Attributes usually come in name/value pairs like: name=”value”

The href Attribute

HTML links are defined with the <a> tag. The link address is specified in the href attribute:

<!DOCTYPE html>

<html>

<body>

<h2>The href Attribute</h2>

<p>HTML links are defined with the a tag. The link address is specified in the href attribute:</p>

<a href=”https://www.w3schools.com”>This is a link</a>

</body>

</html>

The href Attribute

HTML links are defined with the a tag. The link address is specified in the href attribute:

This is a link

You will learn more about links and the <a> tag later in this tutorial.

The src Attribute

HTML images are defined with the <img> tag.

The filename of the image source is specified in the src attribute:

 

<!DOCTYPE html>

<html>

<body>

<h2>The src Attribute</h2>

<p>HTML images are defined with the img tag, and the filename of the image source is specified in the src attribute:</p>

<img src=”img_girl.jpg” width=”500″ height=”600″>

</body>

</html>

The src Attribute

HTML images are defined with the img tag, and the filename of the image source is specified in the src attribute:

The width and height Attributes

 HTML images also have width and height attributes, which specifies the width and height of the image:

 

<!DOCTYPE html>

<html>

<body>

<h2>The src Attribute</h2>

<p>HTML images are defined with the img tag, and the filename of the image source is specified in the src attribute:</p>

<img src=”img_girl.jpg” width=”500″ height=”600″>

</body>

</html>

The src Attribute

HTML images are defined with the img tag, and the filename of the image source is specified in the src attribute:

The alt Attribute

The alt attribute specifies an alternative text to be used, if an image cannot be displayed.

The value of the alt attribute can be read by screen readers. This way, someone “listening” to the webpage, e.g. a vision impaired person, can “hear” the element.

 

<!DOCTYPE html>

<html>

<body>

<h2>The alt Attribute</h2>

<p>The alt attribute should reflect the image content, so users who cannot see the image gets an understanding of what the image contains:</p>

<img src=”img_girl.jpg” alt=”Girl with a jacket” width=”500″ height=”600″>

</body>

</html>

The alt Attribute

The alt attribute should reflect the image content, so users who cannot see the image gets an understanding of what the image contains:

Girl with a jacket

The style Attribute

The style attribute is used to specify the styling of an element, like color, font, size etc.

 

<!DOCTYPE html>

<html>

<body>

<h2>The style Attribute</h2>

<p>The style attribute is used to specify the styling of an element, like color:</p>

<p style=”color:red”>This is a red paragraph.</p>

</body>

</html>

The style Attribute

The style attribute is used to specify the styling of an element, like color:

This is a red paragraph.

The lang Attribute

The language of the document can be declared in the <html> tag.

The language is declared with the lang attribute.

Declaring a language is important for accessibility applications (screen readers) and search engines:

 

<!DOCTYPE html>
<html lang=”en-US”>
<body>



</body>
</html>

The first two letters specify the language (en). If there is a dialect, add two more letters (US).


The title Attribute

Here, a title attribute is added to the <p> element. The value of the title attribute will be displayed as a tooltip when you mouse over the paragraph:

 

<!DOCTYPE html>

<html>

<body>

<h1>About W3Schools</h1>

<p title=About W3Schools>

You cannot omit quotes around an attribute value 

if the value contains spaces.

</p>

<p><b>

If you move the mouse over the paragraph above,

your browser will only display the first word from the title.

</b></p>

</body>

</html>

About W3Schools

You cannot omit quotes around an attribute value if the value contains spaces.

If you move the mouse over the paragraph above, your browser will only display the first word from the title.

We Suggest: Use Lowercase Attributes

The HTML5 standard does not require lowercase attribute names.

The title attribute can be written with uppercase or lowercase like title or TITLE.

We recommends lowercase in HTML, and demands lowercase for stricter document types like XHTML.

We Suggest: Quote Attribute Values

The HTML5 standard does not require quotes around attribute values.

The href attribute, demonstrated above, can be written without quotes:

 

<a href=https://www.w3schools.com>

<a href=”https://www.w3schools.com”>

We recommends quotes in HTML, and demands quotes for stricter document types like XHTML.

Sometimes it is necessary to use quotes. This example will not display the title attribute correctly, because it contains a space:

 

<!DOCTYPE html>

<html>

<body>

<h1>About W3Schools</h1>

<p title=About W3Schools>

You cannot omit quotes around an attribute value 

if the value contains spaces.

</p>

<p><b>

If you move the mouse over the paragraph above,

your browser will only display the first word from the title.

</b></p>

</body>

</html>

 

About W3Schools

You cannot omit quotes around an attribute value if the value contains spaces.

If you move the mouse over the paragraph above, your browser will only display the first word from the title.

Single or Double Quotes?

Double quotes around attribute values are the most common in HTML, but single quotes can also be used.

In some situations, when the attribute value itself contains double quotes, it is necessary to use single quotes:

<p title=’John “ShotGun” Nelson’>

Or vice versa:

<p title=”John ‘ShotGun’ Nelson”>

Chapter Summary

  • All HTML elements can have attributes
  • The title attribute provides additional “tool-tip” information
  • The href attribute provides address information for links
  • The width and height attributes provide size information for images
  • The alt attribute provides text for screen readers
  • At W3Schools we always use lowercase attribute names
  • At W3Schools we always quote attribute values