Flash cards
Review the key moves
What is the main idea behind HTML Images?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
<___ src="pic_trulli.jpg"Put the learning moves in the order that makes the concept easiest to apply.
Images can improve the design and the appearance of a web page.
Example
<img src="pic_trulli.jpg"
alt="Italian Trulli">Live preview
Example
<img src="img_girl.jpg"
alt="Girl in a jacket">Live preview
Example
<img src="img_chania.jpg"
alt="Flowers in Chania">Live preview
HTML Images Syntax
The HTML <img> tag is used to embed an image in a web page.
Images are not technically inserted into a web page; images are linked to web pages. The <img> tag creates a holding space for the referenced image.
The <img> tag is empty, it contains attributes only, and does not have a closing tag.
The <img> tag has two required attributes:
- src - Specifies the path to the image
- alt - Specifies an alternate text for the image
Syntax
<img src="
url
" alt="
alternatetext
">The src Attribute
The required src attribute specifies the path (URL) to the image.
Note
When a web page loads, it is the browser, at that moment, that gets the image from a web server and inserts it into the page. Therefore, make sure that the image actually stays in the same spot in relation to the web page, otherwise your visitors will get a broken link icon. The broken link icon and the alt text are shown if the browser cannot find the image.
Example
<img src="img_chania.jpg" alt="Flowers
in Chania">Live preview
The alt Attribute
The required 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:
Example
<img src="img_chania.jpg" alt="Flowers
in Chania">Live preview
If a browser cannot find an image, it will display the value of the alt attribute:
Example
<img src="wrongname.gif" alt="Flowers
in Chania">Live preview
Tip
A screen reader is a software program that reads the HTML code, and allows the user to "listen" to the content. Screen readers are useful for people who are visually impaired or learning disabled.
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;">Live preview
Alternatively, you can use the width and height attributes:
Example
<img src="img_girl.jpg" alt="Girl in a jacket" width="500" height="600">Live preview
The width and height attributes always define 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 web page might flicker while the image loads.
Width and Height, or Style?
The width , height , and style attributes are all valid in HTML.
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>Live preview
Images in Another Folder
If you have your images in a sub-folder, you must include the folder name in the src attribute:
Example
<img src="/images/html5.gif"
alt="HTML5 Icon" style="width:128px;height:128px;">Live preview
Images on Another Server/Website
Some web sites point to an image on another server.
To point to an image on another server, you must specify an absolute (full) URL in the src attribute:
Example
<img src="https://example.com alt="ExampleSite.com">Live preview
Notes on external images: External images might be under copyright. If you do not get permission to use it, you may be in violation of copyright laws. In addition, you cannot control external images; they can suddenly be removed or changed.
Animated Images
Example
<img src="programming.gif" alt="Computer Man" style="width:48px;height:48px;">Live preview
Image as a Link
To use an image as a link, put the <img> tag inside the <a> tag:
Example
<a href="default.asp">
<img src="smiley.gif" alt="HTML tutorial"
style="width:42px;height:42px;">
</a>Live preview
Image Floating
Use the CSS float property to let the image float to the right or to the left of a text:
Example
<p><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" alt="Smiley face"
style="float:left;width:42px;height:42px;">
The image will float to the left of
the text.</p>Live preview
Tip
To learn more about CSS Float, read our CSS Float Tutorial .
Common Image Formats
Here are the most common image file types, which are supported in all browsers (Chrome, Edge, Firefox, Safari, Opera):
| Abbreviation | File Format | File Extension |
|---|---|---|
| APNG | Animated Portable Network Graphics | .apng |
| GIF | Graphics Interchange Format | .gif |
| ICO | Microsoft Icon | .ico, .cur |
| JPEG | Joint Photographic Expert Group image | .jpg, .jpeg, .jfif, .pjpeg, .pjp |
| PNG | Portable Network Graphics | .png |
| SVG | Scalable Vector Graphics | .svg |
Chapter Summary
- Use the HTML <img> element to define an image
- Use the HTML src attribute to define the URL of the image
- Use the HTML alt attribute to define an alternate text for an image, if it cannot be displayed
- Use the HTML width and height attributes or the CSS width and height properties to define the size of the image
- Use the CSS float property to let the image float to the left or to the right
Note
Loading large images takes time, and can slow down your web page. Use images carefully.
HTML Image Tags
| Tag | Description |
|---|---|
| <img> | Defines an image |
| <map> | Defines an image map |
| <area> | Defines a clickable area inside an image map |
| <picture> | Defines a container for multiple image resources |
For a complete list of all available HTML tags, visit our HTML Tag Reference .