HTML plays an important role and has an important position in the rapid development of the Web. The original intention of HTML was to express the content information of tags (
,
). At the same time, the document layout is completed by the browser, without using any format tags. Slowly, IE continues to add new HTML tags and attributes to the HTML specification, and it becomes increasingly difficult to create sites where the document content is clearly independent of the document presentation layer. So in order to solve this problem, a style other than HTML, namely CSS cascading style sheet, was created.
I learned CSS DIV for a week, and the summary is as follows:
This video mainly talks about using CSS DIV performs web page layout. The first half is some basic CSS styles, and the latter part is some examples. You can use the examples to understand the layout of CSS DIV. Write each block as a div, and then use CSS to control its style to beautify the layout effect, focusing on practical operations.
This video mainly includes the basic syntax and concepts of CSS: how to set text, images, backgrounds, tables, menus and other web elements, as well as the use of CSS filters. There are also some expanded knowledge: comprehensive application of CSS and JavaScript, CSS and XML, CSS and Ajax. There are several large examples later, through which we can deeply understand CSS DIV layout. Put a piece of content in a DIV, and then set the id and class style of its tag in CSS. Maintain the separation of HTML code and CSS code.
Then the three ways to introduce CSS in HTML are as follows:
Some lower version browsers cannot recognize the style tag, which means that lower version browsers will ignore it. The content in the style tag is displayed directly on the page as text. In order to avoid this situation, we use HTML comments () to hide the content without letting it display.
Import external stylesheets that exist within internal stylesheets. Must be at the beginning of the style sheet, above other internal style sheets.
Summary: Learning CSS DIV focuses on understanding and operation. Still needs more practice. No matter which language, it has its advantages and disadvantages.
Advantages of Div CSS:
1. Reduce page loading time
The page size becomes smaller and the browsing speed becomes faster.
2. Easy to modify
HTML page and CSS code are separated, separating the content and presentation of the web page. When modifying the design, you only need to change the style, and it will not break the layout of other styles on the page. This feature is not available in tables.
3. Maintain visual consistency and powerful font and typesetting capabilities
Put all styles in CSS files to avoid effect deviation in different areas or pages.
4. It is beneficial to search engine crawlers: Generally speaking, the table layout bytes of the HTML file of the same page are larger than the bytes of the DIV CSS layout, so it can save search engine crawlers the time to crawl and download the page content.
Disadvantages:
1. High development technology: it must be compatible with various browsers and browser versions have higher requirements.
2. Long development time: It is much more complicated than table positioning, and problems can easily arise.
3. Development costs are relatively high: high technology and long time determine high costs.
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