Web Front-end
HTML Tutorial
【CSS3】-background-origin background-clip background-size_html/css_WEB-ITnose
【CSS3】-background-origin background-clip background-size_html/css_WEB-ITnose
background-origin
Sets the original starting position of the element's background image.
Syntax:
background-origin ： border-box | padding-box | content-box;
parameters respectively indicate whether the background image is from the border , or padding (default value) , or The content area starts to display.
The effect is as follows:
It should be noted that , if the background is not no-repeat, this attribute is invalid, it It will be displayed starting from the border.
Example:
<!DOCTYPE html><html><head> <meta charset="utf-8"><title>背景原点</title><style type="text/css">.wrap { width:220px; border:20px dashed #000; padding:20px; font-weight:bold; color:#000; background:#ccc url(http://static.mukewang.com/static/img/logo_index.png) no-repeat; background-origin:content-box;//内容区域显示 position: relative;}.wrap span { position: absolute; left:0; top:0;}.content { height:80px; border:1px solid #333;}</style> </head> <body><div class="wrap"><span>padding</span> <div class="content">content</div></div></body></html>Effect:
background-clip
is used to clip the background The pictures are cropped appropriately to suit actual needs.
Syntax:
background-clip ： border-box | padding-box | content-box | no-clip
parameters respectively represent filling from the border, or , or content area outwards Crop the background. no-clip means no clipping, and the parameter border-box shows the same effect. The default value of backgroud-clip is border-box.
The effect is as shown below:
Example:
<!DOCTYPE html><html><head> <meta charset="utf-8"><title>背景裁切</title><style type="text/css">.wrap { width:220px; border:20px dashed #000; padding:20px; font-weight:bold; color:#000; background:#ccc url(http://static.mukewang.com/static/img/logo_index.png) no-repeat; background-origin: border-box; background-clip:padding-box; position: relative;}.wrap span { position: absolute; left:0; top:0;}.content { height:80px; border:1px solid #333;}</style> </head> <body><div class="wrap"><span>padding</span> <div class="content">content</div></div></body></html>Effect: padding-box effect:
background-size
Set the size of the background image, displayed as length value or percentage, or via cover and contain to scale the image.
Syntax:
background-size: auto | <长度值> | <百分比> | cover | contain
Value description:
1. auto: Default value, does not change the original height and width of the background image;
2.
4. cover: As the name suggests,
covers, that is, The background image is scaled to to fill the entire container; 5. contain: Contain, that is, the background image is scaled to
one side close to the container To the edge. Tips: You can enter your own code in the editing window on the right to try out the effects of different values.
multiple backgrounds
Multiple backgrounds, that is, the attributes of
backgroundplus
origin
in CSS2 Multiple overlays of new backgrounds composed of , clip and size are abbreviated as each set of values separated by commas ; when written in decomposition, if there is Multiple background images, but only one other attribute (for example, only one background-repeat), indicates that this attribute value applies to all background images. The grammatical abbreviation is as follows:
The above abbreviation can be broken down into the following form:background-image:url1,url2,...,urlN;
background ： [background-color] | [background-image] | [background-position][/background-size] | [background-repeat] | [background-attachment] | [background-clip] | [background-origin],...
Note:
background-repeat : repeat1,repeat2,...,repeatN;backround-position : position1,position2,...,positionN;background-size : size1,size2,...,sizeN;background-attachment : attachment1,attachment2,...,attachmentN;background-clip : clip1,clip2,...,clipN;background-origin : origin1,origin2,...,originN;background-color : color;
Separate the abbreviated values of each group of background with commas;
If there is a size value, it needs to be tight followed by position and separated by "/";- If there are multiple background images and there is only one other attribute (for example, there is only one background-repeat), it means that all background images apply this attribute value.
- Background-color can only be set to one.
- Example:
- Have three separate images:
Use multiple backgrounds Technical implementation:
Example:
Effect:
<!DOCTYPE html><html><head> <meta charset="utf-8"><title>多重背景</title><style type="text/css">.demo{ width: 300px; height: 140px; border: 1px solid #999; background-image: url(http://img.mukewang.com/54cf2365000140e600740095.jpg), url(http://img.mukewang.com/54cf238a0001728d00740095.jpg), url(http://img.mukewang.com/54cf23b60001fd9700740096.jpg); background-position: left top, 100px 0, 200px 0; background-repeat: no-repeat, no-repeat, no-repeat; margin:0 0 20px 0;}.task { width: 300px; height: 140px; border: 1px solid #999; background:url(http://static.mukewang.com/static/img/logo_index.png) left top/75% 50% no-repeat, url(http://static.mukewang.com/static/img/logo_index.png) right bottom/50% 45% no-repeat; }</style> </head> <body><div class="demo"></div><div class="task"></div></body></html>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Is HTML easy to learn for beginners?
Apr 07, 2025 am 12:11 AM
HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.
The Roles of HTML, CSS, and JavaScript: Core Responsibilities
Apr 08, 2025 pm 07:05 PM
HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.
Understanding HTML, CSS, and JavaScript: A Beginner's Guide
Apr 12, 2025 am 12:02 AM
WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
What is an example of a starting tag in HTML?
Apr 06, 2025 am 12:04 AM
AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.
Gitee Pages static website deployment failed: How to troubleshoot and resolve single file 404 errors?
Apr 04, 2025 pm 11:54 PM
GiteePages static website deployment failed: 404 error troubleshooting and resolution when using Gitee...
How to implement adaptive layout of Y-axis position in web annotation?
Apr 04, 2025 pm 11:30 PM
The Y-axis position adaptive algorithm for web annotation function This article will explore how to implement annotation functions similar to Word documents, especially how to deal with the interval between annotations...
HTML, CSS, and JavaScript: Essential Tools for Web Developers
Apr 09, 2025 am 12:12 AM
HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.
How to use CSS3 and JavaScript to achieve the effect of scattering and enlarging the surrounding pictures after clicking?
Apr 05, 2025 am 06:15 AM
To achieve the effect of scattering and enlarging the surrounding images after clicking on the image, many web designs need to achieve an interactive effect: click on a certain image to make the surrounding...
