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Images can improve the design and the appearance of a web page.
HTML Images Syntax
In HTML, images are defined with the tag.
The tag is empty, it contains attributes only, and does not have a closing tag.
The src attribute specifies the URL (web address) of the image:
<img src="url">
The alt Attribute
The alt attribute provides an alternate text for an image, if the user for some reason cannot view it (because of slow connection, an error in the src attribute, or if the user uses a screen reader).
The value of the alt attribute should describe the image:
If a browser cannot find an image, it will display the value of the alt attribute:
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<img src="wrongname.gif" alt="Flowers in Chania">
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Note: The alt attribute is required. A web page will not validate correctly without it.
Image Size - Width and Height
You can use the style attribute to specify the width and height of an image.
Example
<img src="img_girl.jpg" alt="Girl in a jacket" style="width:500px;height:600px;">
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Alternatively, you can use the width and height attributes:
The width and height attributes always defines the width and height of the image in pixels.
Note: Always specify the width and height of an image. If width and height are not specified, the page might flicker while the image loads.
Width and Height, or Style?
The width, height, and Dri VI Park Green Fit Nike style attributes are valid in HTML5.
However, we suggest using the style attribute. It prevents styles sheets from changing the size of images:
Example
<!DOCTYPE html>
<html>
<head>
<style>
img {
width: 100%;
}
</style>
</head>
<body>
<img src="html5.gif" alt="HTML5 Icon" width="128" height="128">
<img src="html5.gif" alt="HTML5 Icon" style="width:128px;height:128px;">
</body>
</html>
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Images in Another Folder
If not specified, the browser expects to find the image in the same folder as the web page.
However, it is common to store images in a sub-folder. You must then include the folder name in the src attribute:
Example
<img src="/images/html5.gif" alt="HTML5 Icon" style="width:128px;height:128px;">
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Images on Another Server
Some web sites store their images on image servers.
Actually, you can access images from any web address in the world:
Example
<img src="https://www.w3schools.com/images/w3schools_green.jpg" alt="W3Schools.com">
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You can read more about file paths in the chapter HTML File Paths.
Animated Images
HTML allows animated GIFs:
Example
<img src="programming.gif" alt="Computer Man" style="width:48px;height:48px;">
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Image as a Link
To use an image as a link, put the tag inside the tag:
Example
<a href="default.asp">
<img src="smiley.gif" alt="HTML tutorial" style="width:42px;height:42px;border:0;">
</a>
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Note: border:0; is added to prevent IE9 (and earlier) from displaying a border around the image (when the image is a link).
Image Floating
Use the CSS float property to let the image float to the right or to the left of a text:
Example
<pPark Nike Green Dri VI Fit >
<img src="smiley.gif" alt="Smiley face" style="float:right;width:42px;height:42px;">
The image will float to the right of the text.
</p>
<p>
<img src="smiley.gif"Smash Multicoloured UMBRELA Multicoloured UMBRELA Smash Smash UMBRELA Multicoloured UMBRELA Smash HWnxn0z6BO alt="Smiley face" style="float:left;width:42px;height:42px;">
The image will float to the left of the text.
</p>
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Tip: To learn more about CSS Float, read our CSS Float Tutorial.
Image Maps
The tag defines an image-map. An image-map is an image with clickable areas.
In the image below, click on the computer, the phone, or the cup of coffee:
Example
<img src="workplace.jpg" alt="Workplace" usemap="#workmap">
<map name="workmap">
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<area shape="rect" coords="34,44,270,350" alt="Computer" href="computer.htm">
<area shape="rect" coords="290,172,333,250" alt="Phone" href="phone.htm">
<area shape="circle" coords="337,300,44" alt="Coffee" href="coffee.htm">
<Moschino W630610 White Love Love Moschino xfqzww/map>
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The name attribute of the tag is associated with the 's usemap attribute and creates a relationship between the image and the map.
The element contains a number of tags, that define the clickable areas in the image-map.
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Background Image
To add a background image on an HTML element, use the CSS property VI Fit Park Dri Green Nike background-image:
Example
To add a background image on a web page, specify the background-image property on the BODY element:
<body style="background-image:url('clouds.jpg')">
<h2>Background Image
</h2>
</body>
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Example
To add a background image on a paragraph, specify the background-image property on the P element:
<body>
<p style="background-image:url('clouds.jpg')">
...
</p>
</body>
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To learn more about background images, study our CSS Background Tutorial.
The Element
HTML5 introduced the
The
Each
The browser will use the first
Example
Show one picture if the browser window (viewport) is a minimum of 650 pixels, and another image if not, but larger than 465 pixels.
<picture>
<source media="(min-width: 650px)" srcset="img_pink_flowers.jpg">
<source media="(min-width: 465px)" srcset="img_white_flower.jpg">
<img src="img_orange_flowers.jpg" alt="Flowers" style="width:auto;">
</picture>
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Note: Always specify an element as the last child element of the element is used by browsers that do not support the
HTML Screen Readers
A screen reader is a software program that reads the HTML code, converts the text, and allows the user to "listen" to the content. Screen readers are useful for people who are blind, visually impaired, or learning disabled.
Chapter Summary
- Use the HTML
element to define an image - Use the HTML
srcattribute to define the URL of the image - Use the HTML
altattribute to define an alternate text for an image, if it cannot be displayed - Use the HTML
widthandheightattributes to define the size of the image - Use the CSS
widthandheightproperties to define the size of the image (alternatively) - Use the CSS
floatproperty to let the image float - Use the HTML
element to define an image-map - Use the HTML
element to define the clickable areas in the image-map - Use the HTML
's elementusemapattribute to point to an image-map - Use the HTML
Note: Loading images takes time. Large images can slow down your page. Use images carefully.
Test Yourself with Exercises!
We have gathered a variety of HTML exercises (with answers) for each HTML Chapter.
HTML Image Tags
| Tag | Description |
|---|---|
| Defines an image | |
| Defines an image-map | |
| Defines a clickable area inside an image-map | |
| Defines a container for multiple image resources |