Summary of new features of CSS3: borders and backgrounds
This series mainly summarizes the understanding of some new features of CSS3, which comes from the book "CSS Revealed".
1. Translucent border
It is best to use hsla instead of rgba for css3. hsla is: h: color value (0~360); s: saturation (0%~100%); l: brightness (0% ~100%); a: Transparency (0~1)
background-clip: clip the background color, the default is border-box (the background color spreads to the border); padding-box (the background color spreads to the padding); content-box (Background color extends to content)
Sample code:
width:200px; height:200px; background: rebeccapurple; border: 10px solid hsla(300, 0%, 50%, 0.5); background-clip: padding-box; //去掉和添加上此项可以看出效果
2. Multiple border implementation
box-shadow: Set or retrieve object shadow, format: box-shadow: none |
length<1>: Horizontal offset, negative value
length<2>: Vertical offset, negative value
length< 3 >: Shadow blur value, non-negative value Value
length<4>: extension length, negative value
inset: expressed as inner shadow, empty means outer shadow
You can set multiple sets of effects, and use between multiple sets Separate by commas (use the box-shadow and overlapping features to set multiple borders, but the border style cannot be striped, dotted, etc.)
If you want to set the search text shadow, use the text-shadow attribute
outline Realize two borders (only two borders can be realized, but the border style is flexible)
3. Background positioning
background-position: background positioning, the value description is as follows
center, left, top, bottom, right etc. all indicate where the background starts to display. If you set repeated tiles, there will be different effects. The value can be a numerical value or a percentage: background-position: right 20px bottom 30px;
background-origin: the positioning parameter of the background image , three-valued context-box, padding-box, border-box, etc.
clac() function to calculate width
The sample code is as follows:
background-image: url('../img/bck.png'); background-repeat: no-repeat; background-size: 40px 40px; width:200px; height:200px; margin-top:10px; border: 5px solid red; --background-position: right 0px bottom 0px; background-origin: content-box; background-position: calc(100% - 50px); padding: 10px;
4. Multiple rounded corners
box-shadow: Its rounded corners will follow the border-radius, but outline does not meeting.
The minimum shadow (box-shadow) calculation formula is: Pythagorean theorem, when setting the shadow, it should be greater than this value
Sample code:
margin: 10px auto; width: 10em; height: 8em; background: tan; border-radius: .8em; padding: 1em; box-shadow: 0 0 0 .6em #655; outline: .6em solid #556;

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

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

In Vue.js, the placeholder attribute specifies the placeholder text of the input element, which is displayed when the user has not entered content, provides input tips or examples, and improves form accessibility. Its usage is to set the placeholder attribute on the input element and customize the appearance using CSS. Best practices include being relevant to the input, being short and clear, avoiding default text, and considering accessibility.

The span tag can add styles, attributes, or behaviors to text. It is used to: add styles, such as color and font size. Set attributes such as id, class, etc. Associated behaviors such as clicks, hovers, etc. Mark text for further processing or citation.

REM in CSS is a relative unit relative to the font size of the root element (html). It has the following characteristics: relative to the root element font size, not affected by the parent element. When the root element's font size changes, elements using REM will adjust accordingly. Can be used with any CSS property. Advantages of using REM include: Responsiveness: Keep text readable on different devices and screen sizes. Consistency: Make sure font sizes are consistent throughout your website. Scalability: Easily change the global font size by adjusting the root element font size.

There are five ways to introduce images in Vue: through URL, require function, static file, v-bind directive and CSS background image. Dynamic images can be handled in Vue's computed properties or listeners, and bundled tools can be used to optimize image loading. Make sure the path is correct otherwise a loading error will appear.

Nodes are entities in the JavaScript DOM that represent HTML elements. They represent a specific element in the page and can be used to access and manipulate that element. Common node types include element nodes, text nodes, comment nodes, and document nodes. Through DOM methods such as getElementById(), you can access nodes and operate on them, including modifying properties, adding/removing child nodes, inserting/replacing nodes, and cloning nodes. Node traversal helps navigate within the DOM structure. Nodes are useful for dynamically creating page content, event handling, animation, and data binding.

Browser plug-ins are usually written in the following languages: Front-end languages: JavaScript, HTML, CSS Back-end languages: C++, Rust, WebAssembly Other languages: Python, Java

1. First, open the settings icon in the lower left corner and click the settings option. 2. Then, find the CSS column in the jumped window. 3. Finally, change the drop-down option in the unknownproperties menu to the error button.

In Vue.js, ref is used in JavaScript to reference a DOM element (accessible to subcomponents and the DOM element itself), while id is used to set the HTML id attribute (can be used for CSS styling, HTML markup, and JavaScript lookup).
