How to set image size in html

HTML is a markup language used to create web pages. It can add various elements and content to web pages, including text, images, audio and video, etc. Among them, images are a common element in web pages, but sometimes we need to control the size of images to make them more suitable for the layout of web content. In this article, we will explore how to set the size of images using HTML.

Image tags in HTML

In HTML, we use the img element to add images to web pages. The img element has a src attribute, which is used to specify the URL address of the image file. For example, to add an image named "example.jpg" to a web page, we can use the following code:

<img src="example.jpg">

In this way, the browser will display the image in the web page. However, this image may be a different size than we expect, so we need to use other properties to control the display size of the image.

Set image size

HTML provides two main attributes to set the display size of images: width and height. These two properties are used to set the width and height of the image, respectively, in pixels. For example, to set the width of an image to 200 pixels, you would use the following code:

<img src="example.jpg" width="200">

Similarly, to set the height of an image to 150 pixels, you would use the following code:

<img src="example.jpg" height="150">

Like this , the image will be displayed according to the specified width and height. It should be noted that if only one of the properties is set, the browser will automatically scale the image proportionally to fit the value of the other property. For example, if only the width attribute is set, the browser will automatically calculate the corresponding height value based on the width-to-height ratio of the original image.

Set width and height at the same time

In addition to setting width and height separately, you can also set these two properties at the same time. In this case, the image will be stretched or compressed to fit the size specified by the two properties. For example, the following code sets the width of the image to 200 pixels and the height to 150 pixels:

<img src="example.jpg" width="200" height="150">

In this way, the size of the image is set to 200 pixels × 150 pixels. It should be noted that setting the width and height at the same time may cause the image to be deformed, thus affecting the display effect of the image.

Use CSS to control image size

In addition to using HTML attributes to set the image size, you can also use CSS to control the display effect of the image. Specifically, we can use the width and height properties in CSS to set the size of the image, for example:

<img src="example.jpg" style="width:200px;height:150px;">

Similarly, we can also define CSS styles in an external style sheet, for example:

<img src="example.jpg" class="thumbnail">

<style>
.thumbnail {
    width:200px;
    height:150px;
}
</style>

In this way, we can use image elements with class "thumbnail" throughout the website, and their sizes will be set to 200 pixels × 150 pixels.

Conclusion

Setting the image size in HTML can help us better control the display effect of the image on the web page. We can use the width and height attributes to set the width and height of the image respectively, or we can set these two attributes at the same time to change the display ratio of the image. Additionally, we can use CSS to precisely control image sizes, making web pages more attractive and readable.

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