h5 new features: drag and drop API, semantic tags, audio and video API, canvas API, geography API, form controls, etc. New features of css3: 1. RGBA and HSLA; 2. text-shadow; 3. border-radius, box-shadow, box-sizing, etc.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
html5 is a language description method for constructing web content. HTML5 is the next generation standard for the Internet. css3 is an upgraded version of css (cascading style sheets) technology. Let’s take a look at the new features of HTML5 and CSS3.
New features of CSS3:
1. Color: new RGBA, HSLA mode
2. Text-shadow
3. Border: Rounded corners (border-radius) Border shadow: box-shadow
4. Box model: box-sizing
5. Background: background-size Set background image The size background-origin sets the origin of the background image
background-clip sets the cropping area of the background image, separated by "," you can set multiple backgrounds for adaptive layout
6. Gradient: linear-gradient, radial-gradient
7. Transition: transition, animation can be realized
8. Custom animation
9. The only pseudo pseudo code introduced in CSS3 The elements are: :selection.
10. Media query, multi-column layout
11. border-image
12.2D transformation: transform: translate(x, y) rotate (x, y) skew(x, y) scale(x, y)
13. 3D conversion
CSS3 new pseudo-class:
p:first-of-type selects each
element that is the first
element of its parent.
p:last-of-type selects each
element that is the last
element of its parent element.
p:only-of-type Selects every
element that is the only
element of its parent.
p:only-child Selects each
element that is the only child element of its parent element.
p:nth-child(2) Selects each
element that is the second child of its parent element.
:enabled, :disabled Control the disabled state of the form control.
:checked, the radio button or check box is selected.
html5 new features:
1. Drag and drop API
2. Better semantic content tags (header ,nav,footer,aside,article,section)
3. Audio, video API(audio,video)
4. Canvas API
5. Geography (Geolocation) API
6. Local offline storage localStorage long-term storage data, the data will not be lost after the browser is closed;
7. The sessionStorage data will be automatically deleted after the browser is closed
8. Form controls, calendar, date, time, email, url, search
9. New technologies webworker, websocket, Geolocation
For more programming related knowledge, please visit:Introduction to Programming! !
The above is the detailed content of What are the new features of h5 and css3. For more information, please follow other related articles on the PHP Chinese website!

TonavigateReact'scomplexecosystemeffectively,understandthetoolsandlibraries,recognizetheirstrengthsandweaknesses,andintegratethemtoenhancedevelopment.StartwithcoreReactconceptsanduseState,thengraduallyintroducemorecomplexsolutionslikeReduxorMobXasnee

Reactuseskeystoefficientlyidentifylistitemsbyprovidingastableidentitytoeachelement.1)KeysallowReacttotrackchangesinlistswithoutre-renderingtheentirelist.2)Chooseuniqueandstablekeys,avoidingarrayindices.3)Correctkeyusagesignificantlyimprovesperformanc

KeysinReactarecrucialforoptimizingtherenderingprocessandmanagingdynamiclistseffectively.Tospotandfixkey-relatedissues:1)Adduniquekeystolistitemstoavoidwarningsandperformanceissues,2)Useuniqueidentifiersfromdatainsteadofindicesforstablekeys,3)Ensureke

React's one-way data binding ensures that data flows from the parent component to the child component. 1) The data flows to a single, and the changes in the state of the parent component can be passed to the child component, but the child component cannot directly affect the state of the parent component. 2) This method improves the predictability of data flows and simplifies debugging and testing. 3) By using controlled components and context, user interaction and inter-component communication can be handled while maintaining a one-way data stream.

KeysinReactarecrucialforefficientDOMupdatesandreconciliation.1)Choosestable,unique,andmeaningfulkeys,likeitemIDs.2)Fornestedlists,useuniquekeysateachlevel.3)Avoidusingarrayindicesorgeneratingkeysdynamicallytopreventperformanceissues.

useState()iscrucialforoptimizingReactappperformanceduetoitsimpactonre-rendersandupdates.Tooptimize:1)UseuseCallbacktomemoizefunctionsandpreventunnecessaryre-renders.2)EmployuseMemoforcachingexpensivecomputations.3)Breakstateintosmallervariablesformor

Use Context and useState to share states because they simplify state management in large React applications. 1) Reduce propdrilling, 2) The code is clearer, 3) It is easier to manage global state. However, pay attention to performance overhead and debugging complexity. The rational use of Context and optimization technology can improve the efficiency and maintainability of the application.

Using incorrect keys can cause performance issues and unexpected behavior in React applications. 1) The key is a unique identifier of the list item, helping React update the virtual DOM efficiently. 2) Using the same or non-unique key will cause list items to be reordered and component states to be lost. 3) Using stable and unique identifiers as keys can optimize performance and avoid full re-rendering. 4) Use tools such as ESLint to verify the correctness of the key. Proper use of keys ensures efficient and reliable React applications.


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

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

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 Chinese version
Chinese version, very easy to use

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
