Home > Developer > Web Develop
HTML Explanation:
HTML is an abbreviation for the English Hyper Text mark-up Language (Hypertext Markup Language), which is a standard language (tag) for making Web pages. The equivalent of a uniform set of rules, everyone to abide by him, so that you can let the browser according to the rules of the markup language to explain it.
The browser is responsible for translating the label into a user "readable" format, presented to the user!
# The Hypertext Markup Language is an application under the standard Universal Markup Language and is a specification, a standard that marks individual parts of the page to be displayed by means of marker symbols. The Web page file itself is a text file, by adding a marker in a text file, you can tell the browser how to display the content (such as: How the text is handled, how the picture is arranged, how the image is displayed, etc.).
The composition of the Web page:
A Web page is usually made up of two parts:
HTML responsible for describing the structure and content of the Web page (e.g. title, navigation bar, etc.) CSS is responsible for the Web page's performance (appearance) (such as background color, font style, etc.).
The content between The content between <body> and </body> is the page effect that the browser renders and the user sees. This means that this is the main body of the page. Which is the body's meaning.
The example code is as follows:
<!DOCTYPE HTML><HTMLLang= "en"><Head> <MetaCharSet= "UTF-8"> <title>Title</title></Head><Body></Body></HTML>
1, DOCTYPE
DOCTYPE tells the browser what HTML or XHTML specification to use to parse an HTML document
The HTML language requires a standard when we specify the <! in the first line DOCTYPE html> , when a browser accesses our code, it reads and renders the page that we are displaying in accordance with the standard specified in the HTML code.
Why to use <! DOCTYPE html> this to tell the browser???????? ：
DOCTYPE mode:
Let's look at the doctype pattern.
The problem arises:
When Netscape4 (the early browser of Netscape) and IE4 (Microsoft's early browser) implemented the CSS mechanism, it did not follow the standards presented by the Web-company. Netscape4 provided poor support, while IE4, though close to the standard, still failed to fully correct the standard of support. Although IE 5 fixes many of the IE4 problems (bugs), it still continues with other failures in the CSS implementation (mainly the box model).
To ensure that their websites are displayed correctly in different browsers, Web developers have to use CSS based on the specifications of each browser. As a result, most Web sites do not conform to the CSS implementation standards.
However, as standard consistency becomes more important, browser developers have to face a difficult choice: the standard of gradual follow-up is the way forward. But changing the implementation of the existing CSS, complete to follow the standard, will make many sites more or less damaged. If the browser suddenly resolves the existing CSS in the correct way, the stale site display will inevitably be affected.
As a result, it can be problematic to follow standards immediately, but ignoring the standards will also keep the chaos of the browser war (a piece of competition between Microsoft and Netscape).
Solution:
In other words, all browsers need to provide two modes: quirks mode (i.e. compatibility mode) serves legacy rules, and strict mode serves Standard rules. The Mac platform's IE browser is the first to implement these two modes, Mozilla, Safari, Opera and Windows platform IE6 also successively implemented these two modes. The IE5 and Netscape4 of the Windows platform provide only weird patterns.
Choosing which mode to use requires a trigger, and "Doctyp toggle" is used for this purpose. According to the standard: any one (x) HTML document must have a DOCTYPE: DTD (document type definition) is a set of machine-readable rules that indicate what is allowed in the (x) HTML document, what is not allowed, and what DOCTYPE is used to tell the browser which DTD to use, Usually put in the (X) HTML document at the beginning of the declaration) to tell other people the type of the document style
Talk about HTML
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
