Attributes provide additional information about HTML elements.
HTML links are defined with the <a> tag. The link address is specified in the href attribute:
<ahref="https://www.w3schools.com">This is a link</a>Try it Yourself »You will learn more about links and the <a> tag later in this tutorial.
HTML images are defined with the <img> tag.The filename of the image source is specified in the src attribute:
<img src="img_girl.jpg">Try it Yourself »
Images in HTML have a set of size attributes, which specifies the width and height of the image:
<img src="img_girl.jpg"width="500" height="600">Try it Yourself »The image size is specified in pixels: width="500" means 500 pixels wide.You will learn more about images in our HTML Images chapter.
The alt attribute specifies an alternative text to be used, when an image cannot be displayed.The value of the attribute can be read by screen readers. This way, someone "listening" to the webpage, e.g. a blind person, can "hear" the element.
<img src="img_girl.jpg"alt="Girl with a jacket">Try it Yourself »The alt attribute is also useful if the image does not exist:
See what happens 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 is used to specify the styling of an element, like color, font, size etc.
<p style="color:red">I am a paragraph</p>Try it Yourself »You will learn more about styling later in this tutorial, and in our CSS Tutorial.
The language of the document can be declared in the tag.The language is declared with the langattribute.Declaring a language is important for accessibility applications (screen readers) and search engines:
...The first two letters specify the language (en). If there is a dialect, use two more letters (US).
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:
<p title="I'm a tooltip">
This is a paragraph.
</p>Try it Yourself »
The HTML5 standard does not require lowercase attribute names.The title attribute can be written with uppercase or lowercase like title or TITLE.W3C recommends lowercase in HTML, and demands lowercase for stricter document types like XHTML.At W3Schools we always use lowercase attribute names.
The HTML5 standard does not require quotes around attribute values.The href attribute, demonstrated above, canbe written without quotes:
<a href=https://www.w3schools.com>Try it Yourself »
<a href="https://www.w3schools.com">Try it Yourself »W3C 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:
<p title=About W3Schools>Try it Yourself »Using quotes are the most common. Omitting quotes can produce errors.
At W3Schools we always use quotes around attribute values.
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">Try it Yourself »
title attribute provides additional "tool-tip" informationhref attribute provides address information for linkswidth and height attributes provide size information for imagesalt attribute provides text for screen readersExercise 1 » Exercise 2 » Exercise 3 » Exercise 4 » Exercise 5 »
Below is an alphabetical list of some attributes often used in HTML:AttributeDescriptionaltSpecifies an alternative text for an image, when the image cannot be displayeddisabledSpecifies that an input element should be disabledhrefSpecifies the URL (web address) for a linkidSpecifies a unique id for an elementsrcSpecifies the URL (web address) for an imagestyleSpecifies an inline CSS style for an elementtitleSpecifies extra information about an element (displayed as a tool tip)
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