30 Advanced Skills of DIV CSS. Many novices on web pages are hovering on the threshold of professional coding, and the tutorials on the Internet are uneven and mixed, which can easily make novices confused. Here is a summary of 30 "secret techniques" for web page coding. As long as you keep them in mind during the coding process and use them flexibly, you will definitely write beautiful code and enter the ranks of professional developers as soon as possible.
1. Be sure to close the tag. In previous page source codes, we often saw statements like this:
Perhaps we could tolerate such unclosed tags in the past, but by today's standards, this is highly undesirable and must be avoided 100%. Be sure to close your tags, otherwise they will fail verification and be prone to some unforeseen problems.
It is best to use this form:
2. Declare the correct document type (DocType)
The author has joined many CSS forums earlier, There, if any user encounters a problem, we will recommend him to do two things first:
1. Verify the CSS file and resolve all visible errors
2. Add the document type Doctype
DOCTYPE is defined before the HTML tag appears. It tells the browser whether the page contains HTML, XHTML,
or a mixture of both, so that the browser can correctly parse the tag.
There are generally four document types to choose from:
There have been different opinions on what document type declaration to use. It is generally considered that using the strictest declaration is the best choice, but research shows that most browsers will use ordinary methods to parse this declaration, so many people choose to use the HTML4.01 standard. The bottom line when choosing a statement is whether it is really suitable for you, so you have to consider it comprehensively to choose a statement that is suitable for your project.
3. Do not use embedded CSS styles. When you are immersed in writing code, you may often add a little embedded CSS code casually or lazily, like this:
Oncoding Coding Camp
This may seem convenient and problem-free, but it will cause problems in your code.
When you start writing code, it is best to start adding style code after the content structure is complete.
This coding method is like guerrilla warfare, a very copycat approach. ??Chris Coyier
A better approach is to define the style of this P in the style sheet file:
#someElement > p { color: red; }
4. Introduce all style sheet files in the head tag of the page. Theoretically, you can introduce CSS style sheets anywhere, but the HTML specification recommends introducing them in the head tag of the web page, which can speed up the rendering speed of the page.
During the development process of Yahoo, we found that introducing style sheets in the head tag will speed up the loading of web pages,
because this allows the page to be rendered gradually. ?? ySlow Team
5. Introduce JavaScript files at the bottom of the page
One principle to remember is to make the page appear in front of the user as quickly as possible. When loading a script, the page will pause loading until the script is fully loaded. So it will waste more time of users.
If your JS file only needs to implement certain functions (such as button click events), then feel free to introduce it at the bottom of the body. This is definitely the best way.
Example:
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