What are the new features of h5 and css3

h5’s new features include: 1. Semantic tags; 2. Form enhancement; 3. Video and audio support; 4. Canvas drawing; 5. Local storage; 6. Drag and drop API; 7. Geography API. The new features of css3 are: 1. RGBA and HSLA color modes; 2. Text shadow; 3. Border rounded corners; 4. Box model; 5. Multi-column layout; 6. Flexible box layout; 7. Grid layout; 8. Gradients and shadows; 9. Transitions and animations.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

HTML5 is a language description method for constructing Web content and is considered one of the core technologies of the Internet. HTML5 is the next generation standard for the Internet and a language method for constructing and presenting Internet content.

CSS3 is an upgraded version of CSS technology, which refers to "Cascading Style Sheets Level 3". On the basis of CSS2.1, many powerful new features have been added to help developers solve some practical problems, and there is no need for non-semantic tags, complex JavaScript scripts and images.

1. New features of HTML5:

1. Semantic tags: HTML5 introduces a series of new semantic tags, such as &lt ;header>, <footer>, <nav>, <section> etc. These tags not only help to better describe the structure and content of the web page, but also improve the readability and maintainability of the code.

2. Form enhancement: HTML5 provides more functions and types for form elements, such as date picker, email verification, number input, etc. At the same time, functions such as form validation and form auto-completion are also introduced, which greatly enhances the interactivity and usability of the form.

3. Video and audio support: HTML5 natively supports video and audio playback. Through the <video> and <audio> tags, developers can easily embed audio and audio in web pages. Video content. At the same time, APIs for controlling and customizing media playback are also provided.

4. Canvas drawing: HTML5 introduces the <canvas> tag and corresponding API, allowing developers to use JavaScript to draw graphics, animations and games on web pages. This provides developers with more powerful graphics capabilities.

5. Local storage: HTML5 provides Web Storage and IndexedDB APIs, allowing data to be stored and accessed in the client browser. This provides the possibility for offline applications and caching, improving the availability and performance of web pages.

6. Drag and drop API: HTML5 provides a drag and drop API, allowing developers to create drag and drop functions to increase the user's interactive experience.

7. Geolocation API: The Geolocation API of HTML5 allows web applications to obtain the user's geographical location information, which helps to implement location-based services and functions.

2. New features of CSS3:

1. RGBA and HSLA color modes: CSS3 introduces RGBA and HSLA color modes, making development Users can more flexibly control the transparency and tint of colors.

2. Text-shadow: CSS3 allows you to add shadow effects to text, which increases the visual layering of the text.

3. Border-radius and border-image: CSS3 provides more flexible border style settings, making it easy to add rounded borders to elements. Or use an image as a border.

4. Box model (box-sizing): CSS3 introduces a new box model attribute box-sizing, which allows developers to more flexibly control the box model calculation method of elements.

5. Multicolumns: CSS3 supports multi-column layout, allowing developers to easily distribute text or content across multiple columns.

6. Flexible box layout (flexbox): CSS3 introduces the flexible box layout model, making it easier for developers to adjust the alignment, direction, and order of elements.

7. Grid layout (grid): CSS3 provides a grid layout model, allowing developers to create complex two-dimensional grid layouts.

8, gradients and shadows: CSS3 supports linear gradient and radial gradient effects, as well as shadow effects, which can be used to create rich visual effects.

9. Transition and animation: CSS3 supports transition and animation effects, allowing developers to create smooth visual effects and animation effects on web pages.

These new features allow developers to create web pages and applications more quickly and efficiently, while providing more visual effects and interaction methods to improve user experience.

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