Front-end interview questions (focus on finishing): talk about your understanding of web standards and W3c, what is ECMA, what is html, browser and development tools introduction

1. Understanding of web standards and W3C

1.1 web standards

All html tags must be lowercase.
These tags are all in pairs. (To be precise, these labels must be closed).
Tags can be nested, but not cross-nested.

1.2 Understanding of W3C

W3C: The World Wide Web Consortium is
mainly responsible for the development of web standards. HTML5 is the standard they developed. (Html/css these writing methods)

Second, what is ECMA

ECMA is the abbreviation of European Computer Manufacturers Association, which is the European Computer Manufacturers Association.

The ECMA organization designated a standard called ECMA-262, and all scripting languages designed according to this standard are called
ECMAScript.

Both JavaScript and JScript are designed in accordance with the ECMA-262 standard.

So the javasript language we learn belongs to ECMAScript. ES5 \ ES6 refers to ECMAScript5 and ECMAScript6.

Three, what is html

HyperText Markup Language (English: HyperText Markup Language, abbreviation: HTML)

Is a standard markup language used to create web pages.

The latest version of HTML is html5, or H5 for short, which is the fifth generation of HTML. In October 2014, the World Wide Web Consortium (W3C) completed the standard formulation.

The previous version is html4.01

Four, browser and development tools introduction

4.1 Browser introduction

Use HTML to build your own WEB site. HTML runs on the browser and is parsed by the browser.

Common browsers:

Chrome Firefox IE UC Sogou 360 browser QQ browser Ou Peng travel and so on.

1. Trident kernel: IE first developed or used, also known as IE kernel, 360 browser also uses IE kernel;
2. Webkit kernel: the early kernel of Google Chrome.
3. Blink: The current kernel of Google Chrome .
4. Gecko kernel: The kernel that Netscape 6 started to use in the early days, and later Mozilla FireFox (Firefox browser) also adopted this kernel.
5. Presto kernel: currently only Opera browser uses this kernel.

4.2 Introduction to Development Tools

Development tools: Hbuilder VSCode subline webstorm, etc.

HTML : Responsible for the structure of web pages.
Css : Responsible for the style of the web page.
Javascript : Responsible for the behavior of web pages.