HTML Attributes | html tags and attributes pdf


Attributes provide additional information about HTML elements.

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 specified in the href attribute:

Example

<a href="https://www.w3schools.com">This is a link</a>
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You will learn more about links and the <a> tag in 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:

Example

<img src="img_girl.jpg">
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The width and height Attributes

Image in HTML have a set of size attributes, which specifies the width and height of the image:

Example

<img src="img_girl.jpg" width="500" height="600">
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The image size is specified in pixel: width="500" means 500 pixels wide.
You will learn more about images in the HTML Images chapter.

The alt Attribute

The attribute 'Alt' specifies an alternative text to be used when an image cannot be displayed.
The value of the attributes can be read by screen readers. This way, someone "listening" to the webpage, e.g. a vision impaired person, can "hear" the element.

Example

<img src="img_girl.jpg" alt="Girl with a jacket">
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The alt attribute is also useful if the images does not exist:

Example

See what happen if we try to display an image that does not exist:
<img src="img_typo.jpg" alt="Girl with a jacket">
Try it Yourself »

The style Attribute

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

Example

<p style="color:red">I am a paragraph</p>
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You will learn more about styling later in this tutorials, and in our CSS Tutorial.

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 the 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, use of two more letters (US).

The title Attribute

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

Example

<p title="I'm a tooltip">
This is a paragraph.
</p>
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We Suggest: Use Lowercase Attributes

The HTML5 standard does not require lowercase attributes names.
The 'title' attributes can be written with uppercase or lowercase like title or TITLE.
W3C recommends lowercase in HTML and demands lowercase for stricter document type like XHTML.
At W3Schools we always use lowercase attribute names.

We Suggest: Quote Attribute Values

The HTML5 standard does not require any quotes around attribute values.
The href attribute is demonstrated above, can be written without quotes:

Bad

<a href=https://www.w3schools.com>
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Good

<a href="https://www.w3schools.com">
Try it Yourself »

















W3C recommends quotes in HTML and demands quotes for stricter documents types like XHTML.
Sometimes it is necessary to use quotes. This example will not display the title attributes correctly, because it contains a space:

Example

<p title=About W3Schools>
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Using quotes are the most common. Omitting quotes can produce errors.
At W3Schools we always use quotes around attributes values.

Single or Double Quotes?

Double quote around attribute values are the most common in HTML, but single quotes can also be used.
In some situation, 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">
Try it Yourself »

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 the 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 an attribute values with double quotes HTML

    Exercises

    Test Yourself With Exercises

    Exercise:

    Add one "tooltip" to the paragraph below with the text "About W3Schools".
    <p ="About W3Schools">W3Schools is a web developer's site.</p>



    HTML Attributes

    Below is a alphabetical list of some attributes often used in HTML, which you will learn more about in this tutorial:
    AttributeDescription
    altSpecifies an alternative text for a  image, when the image cannot be displayed
    disabledSpecifies, an input element should be disabled
    hrefSpecifies the URL (web address) of a link
    idSpecifies a unique id for an element
    srcSpecifies URL (web address) for an image
    styleSpecifies an inline CSS style of an element
    titleSpecifies information about an element (displayed as a tool tip)
    A complete list for all attributes for each HTML element, is listed in our: HTML Attribute Reference.

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