


background-origin
Sets the original starting position of the element's background image.
Syntax:
background-origin : border-box | padding-box | content-box;The
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>

The official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,

The article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.

Article discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.

This article demonstrates efficient PNG border addition to webpages using CSS. It argues that CSS offers superior performance compared to JavaScript or libraries, detailing how to adjust border width, style, and color for subtle or prominent effect

The article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159

The article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex

This article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit

The article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 English version
Recommended: Win version, supports code prompts!

Dreamweaver Mac version
Visual web development tools

Atom editor mac version download
The most popular open source editor

Zend Studio 13.0.1
Powerful PHP integrated development environment
