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Today, I would like to share with you the relevant knowledge of what the concept of html5 and css3 is. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Html5 is the fifth major revision of the hypertext markup language HTML, and its main goal is to improve compliance and enhance compliance by making it easier for Web developers and browser creators to follow consensus-based standards. Css3 is an upgraded version of CSS technology, a computer language used to express file styles such as HTML or XML.

The operating environment of this tutorial: windows7 system, CSS3&&HTML5 version, Dell G3 computer.

What is HTML5?

HTML5 is the fifth major revision of Hypertext markup language (HTML), while HTML is a standard programming language for describing the content and appearance of web pages. HTML5 supports traditional HTML and XHTML-style syntax as well as its markup, new API,XHTML, and other new features in error handling.

HTML5 was developed to address compatibility issues that affect the current standard HTML4. One of the biggest differences between HTML5 and previous versions of the standard is that older versions of HTML require proprietary plug-ins and API. This is why pages built and tested in one browser may not load correctly in another browser. HTML5 provides a generic interface to make it easier to load elements For example, you do not need to install the Flash plug-in in HTML5 because the element will run on its own.

The primary goal of HTML5 is to improve compliance and enhance compliance by making it easier for Web developers and browser creators to follow consensus-based standards. It also aims to provide a better, faster, and more consistent user experience for desktop and mobile visitors.

One of the design goals of HTML5 is to support multimedia on mobile devices. New syntax features have been introduced to support this feature, such as video, audio and canvas tags. HTML5 also introduces new features that can really change the way users interact with documents.

Some interesting new features in HTML5:

The canvas element used for painting.

Video and audio elements for media playback

Better support for local offline storage.

New special content elements, such as article, footer, header, nav, section.

New form controls, such as calendar, date, time, email, url, search.

What is CSS3?

CSS is the abbreviation of Cascading Style Sheets (cascading style sheet). It is a computer language used to represent file styles such as HTML (an application of standard general markup language) or XML (a subset of standard general markup language).

CSS can accurately control the layout of elements in a web page at the pixel level, support almost all font size styles, and have the ability to edit web objects and model styles.

CSS3 is an upgraded version of CSS (cascading style sheet) technology, which was developed in 1999. W3C completed the working draft of CSS3 on May 23,2001.It mainly includes box model, list module, hyperlink mode, language module, background and frame, text special effects, multi-column layout and so on.

A major change in the evolution of CSS is the W3C's decision to divide CSS3 into a series of modules. Browser vendors innovate quickly at the pace of CSS, so by adopting a modular approach, elements in the CSS3 specification can move forward at different speeds, because different browser vendors only support given features. But different browsers support different features at different times, which also complicates cross-browser development.

The principle of CSS3, like CSS, is to customize the selector of a stylesheet in a web page, and then refer to a large number of these selectors in the web page.

New features

There are many new features of CSS3, such as fillet effects, graphical boundaries, block shadows and text shadows, transparent effects using RGBA, gradient effects, custom fonts, multi-background images, text or image deformation processing (rotation, scaling, tilting, moving), multi-column layout, media query, etc.

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