Images encoded with Base64 can be embedded in HTML by using the <img> tag. This can help to increase the page load time for smaller images by saving the browser from making additional HTTP requests. Show
Base64 encoding and Data URL go hand-in-hand, as Data URLs reduce the number of HTTP requests that are needed for the browser to display an HTML document. In this snippet, we’ll demonstrate how you can display Base64 images in HTML. The <img> tag has a src attribute and contains the Data URL of the image. A Data URL is composed of two parts, which are separated by a comma. The first part specifies a Base64 encoded image, and the second part specifies the Base64 encoded string of the image. Add also an alt attribute.
Now, see the full code, where we need to place the <img> tag presented above within a <div> element. Example of embedding a Base64 encoded image into HTML:
ImagesImages are used in HTML documents to one: make the page visually effective and two: display information. Images can also be used as links, but this is discussed in the topic on linking. Although images are good for a number of things, a page with too many images often looks too cluttered and can take too long to load, which can be frustrating, and as a business aspect it could lose clients. An image -<img src="url"> To display an image you need to specify the URL of the image using the src attribute, replacing url with the filename of your image. There are several ways this can be done:src="picture.jpg" - the filename if the image is in the same directory as the html file.src="images/picture.jpg" - a relative path when the image is in another
directory.src="http://www.simplehtmlguide.com/images/photo.jpg" - a full URL can also be used.Alternate Text - <img ... alt="?"> The alt attribute defines the text shown in place of an image when the image cannot load. This is actually a required attribute for valid html, and should briefly describe what the image normally would.Image Size - <img ... width="?" height="?"> An
image will normally be shown actual size, but by using the width and height attributes you can change the displayed size. You can specify the size in pixels or as a percentage. Tip: specify the size using the actual size of the image in pixels to force browsers to allocate space for the image before it is even loaded, ensuring you page layout remains the same with or without images displayed.Border - <img ... border="?"> Add a border by specifying the thickness in pixels. You can also
set border="0" to remove the border added when images are used as links. (*)Image Alignment - <img ... align="?"> By default an image appears at the place specified in the html code(as with any other tag). However, you can align an image with the surrounding text or paragraph by setting any of align="left | right | top | bottom | middle" . (*)Spacing -
<img ... vspace="?" hspace="?"> Adjust the whitespace (or runaround space) around an image, in pixels. Use vspace to adjust the vertical spacing above and below, or hspace for the left and right sides. (*)Example:See another images example, and select 'view source' in your browser to see the html code. (*) Important Note:Tags marked with (*) should still work, but have been superseded by Cascading Style Sheets (CSS), which is now the recommended way to change the font, colour, spacing, border or alignment of HTML elements. In the beginning, the Web was just text, and it was really quite boring. Fortunately, it wasn't too long
before the ability to embed images (and other more interesting types of content) inside web pages was added. There are other types of multimedia to consider, but it is logical to start with the humble In order to put a simple image on a webpage, we use the So for example, if your image is called If the image was in an
And so on. Note: Search engines also read
image filenames and count them towards SEO. Therefore, you should give your image a descriptive filename; You could embed the image using its absolute URL, for example:
But this is pointless, as it just makes the browser do more work, looking up the IP address from the DNS server all over again, etc. You'll almost always keep the images for your website on the same server as your HTML. Warning: Most images are copyrighted. Do not display an image on your webpage unless:
Copyright violations are illegal and unethical. In addition, never point your Our above code would give us the following result:
Note: Elements like Alternative textThe next attribute we'll look at is
The easiest way to test your
So, why would you ever see or need alt text? It can come in handy for a number of reasons:
What exactly should you write inside your
Essentially, the key is to deliver a usable experience, even when the images can't be seen. This ensures all users are not missing any of the content. Try turning off images in your browser and see how things look. You'll soon realize how helpful alt text is if the image cannot be seen. Width and heightYou can use the
This doesn't result in much difference to the display, under normal circumstances. But if the image isn't being displayed, for example, the user has just navigated to the page, and the image hasn't yet loaded, you'll notice the browser is leaving a space for the image to appear in:
This is a good thing to do, resulting in the page loading quicker and more smoothly. However, you shouldn't alter the size of your images using HTML attributes. If you set the image size too big, you'll end up with images that look grainy, fuzzy, or too small, and wasting bandwidth downloading an image that is not fitting the user's needs. The image may also end up looking distorted, if you don't maintain the correct aspect ratio. You should use an image editor to put your image at the correct size before putting it on your webpage. Note: If you do need to alter an image's size, you should use CSS instead. Image titlesAs
with links, you can also add
This gives us a tooltip on mouse hover, just like link titles:
However, this is not recommended — It is better to include such supporting information in the main article text, rather than attached to the image. Active learning: embedding an imageIt is now your turn to play! This active learning section will have you up and running with a simple embedding exercise. You are provided
with a basic https://raw.githubusercontent.com/mdn/learning-area/master/html/multimedia-and-embedding/images-in-html/dinosaur_small.jpg Earlier we said to never hotlink to images on other servers, but this is just for learning purposes, so we'll let you off this one time. We would also like you to:
If you make a mistake, you can always reset it using the Reset button. If you get really stuck, press the Show solution button to see an answer:
Annotating images with figures and figure captionsSpeaking of captions, there are a number of ways that you could add a caption to go with your image. For example, there would be nothing to stop you from doing this:
This is OK. It contains the content you need, and is nicely stylable using CSS. But there is a problem here: there is nothing that semantically links the image to its caption, which can cause problems for screen readers. For example, when you have 50 images and captions, which caption goes with which image? A better solution, is to use the HTML
The
Note: From an accessibility viewpoint, captions and
A figure doesn't have to be an image. It is an independent unit of content that:
A figure could be several images, a code snippet, audio, video, equations, a table, or something else. Active learning: creating a figureIn this active learning section, we'd like you to take the finished code from the previous active learning section, and turn it into a figure:
If you make a mistake, you can always reset it using the Reset button. If you get really stuck, press the Show solution button to see an answer:
CSS background imagesYou can also use CSS to embed images into webpages (and JavaScript, but
that's another story entirely). The CSS
The resulting embedded image is arguably easier to position and control than HTML images. So why bother with HTML images? As hinted to above, CSS background images are for decoration only. If you just want to add something pretty to your page to enhance the visuals, this is fine. Though, such images have no semantic meaning at all. They can't have any text equivalents, are invisible to screen readers, and so on. This is where HTML images shine! Summing up: if an image has meaning, in terms of your content, you should use an HTML image. If an image is purely decoration, you should use CSS background images. Test your skills!You've reached the end of this article, but can you remember the most important information? You can find some further tests to verify that you've retained this information before you move on — see Test your skills: HTML images. SummaryThat's all for now. We have covered images and captions in detail. In the next article, we'll move it up a gear, looking at how to use HTML to embed video and audio content in web pages.
In this moduleHow do I display an image in HTML page?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.. How do I display a JPEG image in HTML?To display an image you need to specify the URL of the image using the src attribute, replacing url with the filename of your image. There are several ways this can be done: src="picture. jpg" - the filename if the image is in the same directory as the html file.
Why is my image not showing in HTML?Why Is My Image Not Showing up in HTML? One of the reasons why your HTML image not showing in browser is that its file is not located in the same folder that is indicated within your tag. Also, the image may not load because the file name specified in the <img> tag does not match that of your image file.
How do I display an image in my browser?The <img> tag
The image tag is used to insert an image. It contains only one attribute, and does not have a closing tag. The image URL can be defined by the src attribute.
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