1. Basic learning
CSS is the abbreviation of Cascading Style Sheets. It is a markup language. It does not require compilation and can be directly used by the browser. Execution (belongs to browser interpreted language).
The CSS file can also be said to be a text file. It contains some CSS tags. The CSS file must use css as the file name suffix. You can simply change the CSS file , changing the overall presentation of a web page can reduce our workload, so it is a required course for every web designer.
Link type (href
<head> <link rel="stylesheet" type="text/css" href="http://www.dreamdu.com/style.css" /></head>
>
<head> <style type="text/css">@import url(http://www.dreamdu.com/style.css);</style></head>
Note: The style tag should be inside the head tag.
Inline styles
<style type="text/css">/* ----------文字样式开始---------- *//* 梦之都白色12象素文字 */.dreamduwhite12px { color:white; font-size:12px; }/* 梦之都黑色16象素文字 */.dreamdublack16px { color:black; font-size:16px; }/* ----------文字样式结束---------- */</style>
CSS selector is the name of a CSS style. When a CSS style is displayed in an XHTML document, a CSS is used.
<p style="font-size: 10px; color: #FFFFFF;"> 使用CSS内联引用表现段落.</p>
ID Selector
table > XHTML p{ font-size:12px;} www.dreamdu.com #id_selector{font-size:12px;} id与class选择符在CSS与XHTML中的用法总结 CSS中的写法 XHTML中的写法 标签选择符 p{font-size:12px;} www.dreamdu.com id选择符 #id_selector{font-size:12px;} 梦之都 class选择符 .class_selector{font-size:12px;} 梦之都 Dream City Separation of content and performance. With CSS, the content (XHMTL) and performance of the web page can be separated. Using CSS can reduce the amount of code on the web page and increase the browsing speed of the web page (1) They belong to different categories. Link belongs to the XHTML tag, and @import is completely a method provided by CSS. When a page is loaded (that is, when viewed by a viewer), the CSS referenced by link will be loaded at the same time, while the CSS referenced by @import will wait until the page is completely downloaded before being loaded. So sometimes when browsing the page where @import loads CSS, there will be no style at first (it just flickers), which is quite obvious when the network speed is slow. Since @import was proposed by CSS2.1, old browsers do not support it. @import can only be recognized by IE5 or above, but the link tag does not have this problem. When using JavaScript to control the dom to change the style, you can only use the link tag, because @import cannot be controlled by the dom. Tables are used for layout, and forms are used to transmit data. Forms can be included in tables, and tables can also be included in forms. Use tables to Lay out the data in the form, If you have data to provide to the background program, such as an input box, text box, etc., these elements usually need to be placed in a form so that the data submission can be completed. This article only organizes some simple content of CSS. As for other powerful functions, we still need to continue to explore and gradually deepen in future studies. Related reading: Basic basic CSS tutorial Summary of the usage of id and class selectors in CSS and XHTML
Writing in CSS Tag selector
id selector
< p id="id_selector">Dream City class selector td>
.class_selector{font-size:12px;}
3. Advantages
1. Map
2. Analysis of difficulties
2.1 The difference between link style (link) and import style (@import) in external reference CSS
In addition to loading CSS, the link tag can also do many other things, such as defining RSS, defining rel connection attributes, etc. @import can only load CSS.
(2) Difference in loading order.
(3) Differences in compatibility.
(4) Differences in using DOM to control styles.
2.2 The difference between tables and forms
3. Editor’s message
CSS is mainly used to control the style of web page display. Through CSS, the content in HTML can show brilliant effects, just like applying makeup to a person. If used appropriately, the effect will be good.
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