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Images can improve the design and the appearance of a web page
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:
<img src="url" alt="alternatetext">
The required src
attribute specifies the path (URL) to the image.
alt
text are shown if the browser cannot find the image.
<img src="img_chania.jpg" alt="Flowers
in Chania">
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:
<img src="img_chania.jpg" alt="Flowers
in Chania">
If a browser cannot find an image, it will display the value of the alt
attribute:
<img src="wrongname.gif" alt="Flowers
in Chania">
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.
You can use the style
attribute to specify the width and
height of an image.
<img src="img_girl.jpg" alt="Girl in a jacket" style="width:500px;height:600px;">
Alternatively, you can use the width
and height
attributes:
<img src="img_girl.jpg" alt="Girl in a jacket" width="500" height="600">
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.
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:
<!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>
If you have your images in a sub-folder, you must include the folder
name in the src
attribute:
<img src="/images/html5.gif"
alt="HTML5 Icon" style="width:128px;height:128px;">
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:
<img src="/images/w3resource_green.jpg" alt="W3C">
HTML allows animated GIFs:
<img src="programming.gif" alt="Computer Man" style="width:48px;height:48px;">
To use an image as a link, put the <img>
tag inside the <a>
tag:
<a href="default">
<img src="smiley.gif" alt="HTML tutorial"
style="width:42px;height:42px;">
</a>
Use the CSS float
property to let the image float to the right or to the left of a text:
<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>
Tip: To learn more about CSS Float, read our CSS Float Tutorial.
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 |
<img>
element to define an imagesrc
attribute to define the URL of the imagealt
attribute to define an alternate text for an image, if it cannot be displayedwidth
and height
attributes
or the CSS width
and height
properties to define the size of the imagefloat
property to let the image float
to the left or to the rightNote: Loading large images takes time, and can slow down your web page. Use images carefully.
Use the HTML image attributes to set the size of the image to 250 pixels wide and 400 pixels tall.
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.