How to set image size in html-HTML Tutorial-php.cn

Home

Web Front-end

HTML Tutorial

How to set image size in html

青灯夜游

May 06, 2021 pm 02:48 PM

htmlImage size

Method: 1. Use the width and height attributes of the img tag, the syntax ""; 2. Use the css width and height attributes, syntax "img{width: value; height: value}".

How to set image size in html

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

Method 1: Use the width and height attributes of the img tag

The height and width attributes of the tag set the size of the image.

<img  src="/static/imghwm/default1.png"  data-src="img/1.jpg"  class="lazy"      style="max-width:90%"  style="max-width:90%"/ alt="How to set image size in html" >

How to set image size in html

Why use the height and width attributes

Have you ever seen the content of a document appear irregularly when it loads? move. This happens because the browser is constantly re-laying out the page in order to be able to display each loaded image. The browser determines the size of the image by downloading and parsing the width and height of the image, and then leaves a corresponding rectangular space in the display window. The browser then adjusts the display layout of the page to insert the image into the display. This also tells us that the image is an independent file, and it is loaded independently from the source file.

But this is not the most efficient way to display a document, because the browser must check each image file and calculate their screen space before displaying adjacent and subsequent document content. This may cause a very large delay in the display of the document, interrupting the user's reading.

A more efficient method for creators is to specify the dimensions of the image through the height and width attributes of the How to set image size in html

tag. In this case, the browser reserves a location for the image before downloading it, thus speeding up the display of the document and preventing the document content from moving. Both properties are required to be integer values and represent the image dimensions in pixels. The order in which these two attributes appear in the How to set image size in html

tag is not important.

Problems with height and width attributes

Although the height and width attributes of the How to set image size in html

tag can improve performance and allow you to implement some tricks, there is a problem when using them There are still some tricky negative effects. Even if the user has turned off automatic image downloading, the browser still has to display the space reserved for the image in the specified size. What this leaves the reader with is usually an empty frame with a meaningless icon indicating that this is where the image should be placed. At this point the page will look really bad, like it's not finished at all, and most of the content will be useless. If you don't use these specified sizes, the browser will just place an image icon in the text so that at least some text is still readable in the display.

Recommended tutorial: "

html video tutorial"

Method 2: Using the width and height attributes of css

width attribute Set the width of the element, and the height attribute sets the height of the element.

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<style>
			img{
				width:200px ;
				height: 200px;
			}
		</style>
	</head>
	<body>
		<img  src="/static/imghwm/default1.png"  data-src="img/1.jpg"  class="lazy"  / alt="How to set image size in html" >
	</body>
</html>

How to set image size in html

For more programming related knowledge, please visit:

Programming Video! !

The above is the detailed content of How to set image size in html. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Give an example of an HTML tag with an attribute.May 16, 2025 am 12:02 AM

The usage methods of HTML tags and attributes include: 1. Basic usage: Use tags such as and, and add necessary information through attributes such as src and href. 2. Advanced usage: Use data-* custom attributes to achieve complex interactions. 3. Avoid common mistakes: Make sure the property values are surrounded by quotes. 4. Performance optimization: Keep it simple, use standard attributes and CSS class names to ensure that the image has alt attributes. Mastering these will improve web development skills.

What is the difference between an HTML tag and an HTML attribute?May 14, 2025 am 12:01 AM

HTMLtagsdefinethestructureofawebpage,whileattributesaddfunctionalityanddetails.1)Tagslike,,andoutlinethecontent'splacement.2)Attributessuchassrc,class,andstyleenhancetagsbyspecifyingimagesources,styling,andmore,improvingfunctionalityandappearance.

The Future of HTML: Evolution and TrendsMay 13, 2025 am 12:01 AM

The future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.

Why are HTML attributes important for web development?May 12, 2025 am 12:01 AM

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

What is the purpose of the alt attribute? Why is it important?May 11, 2025 am 12:01 AM

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

HTML, CSS, and JavaScript: Examples and Practical ApplicationsMay 09, 2025 am 12:01 AM

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

How do you set the lang attribute on the tag? Why is this important?May 08, 2025 am 12:03 AM

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

What is the purpose of HTML attributes?May 07, 2025 am 12:01 AM

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

See all articles