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:
- Some text here.
- You get the idea.
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:
-//W3C//DTD HTML 4.01//EN” “http://www.w3 .org/TR/html4/strict.dtd”>
-//W3C//DTD HTML 4.01 Transitional//EN” “http://www.w3.org /TR/html4/loose.dtd”>
-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR /xhtml1/DTD/xhtml1-transitional.dtd”>
-//W3C//DTD XHTML 1.0 Strict//EN” “http://www.w3.org /TR/xhtml1/DTD/xhtml1-strict.dtd”>
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:
And now you know my favorite kinds of corn.

HTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.


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