HTML and CSS coding specification content
1. HTML specification
2. CSS specifications
3. Notes:
4. Commonly used naming rules
5. CSS style sheet file naming
6. File naming rules
1. HTML specification:
1. Code specifications
- Add the standards mode declaration to the first line of the page
- Code indentation: Set four spaces with the tab key (usually set the corresponding space size in the lower right corner of the software)
- Except for DOC and 'UTF-8' at the beginning or special circumstances in the head, which can be capitalized, everything else is lowercase, and CSS classes are all lowercase
- It is recommended to specify the lang attribute for the html root element to set the correct language for the document lang="zh-CN"
- Different doctypes will trigger different rendering modes in different browsers
<span class="hljs-doctype"><!DOCTYPE html> <span class="hljs-tag"><<span class="hljs-title">html <span class="hljs-attribute">lang=<span class="hljs-value">"zh-CN"> <span class="hljs-tag"><<span class="hljs-title">head> <span class="hljs-tag"><<span class="hljs-title">meta <span class="hljs-attribute">charset=<span class="hljs-value">"UTF-8"> <span class="hljs-tag"><<span class="hljs-title">meta <span class="hljs-attribute">http-equiv=<span class="hljs-value">"X-UA-Compatible" <span class="hljs-attribute">content=<span class="hljs-value">"IE=Edge"> <span class="hljs-tag"></<span class="hljs-title">head> .... <span class="hljs-tag"></<span class="hljs-title">html> </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
- Don’t use @import
- Compared with the tag, the @import command is much slower, which not only increases the number of additional requests, but also causes unpredictable problems. Alternatives include the following:
- Use multiple elements
- Compile multiple CSS files into one file through a CSS preprocessor like Sass or Less
- CSS file merging function provided through Rails, Jekyll or other systems
- Compared with the tag, the @import command is much slower, which not only increases the number of additional requests, but also causes unpredictable problems. Alternatives include the following:
<code class="hljs xml"><span class="hljs-comment"><!-- Use link elements --> <span class="hljs-tag"><<span class="hljs-title">link <span class="hljs-attribute">rel=<span class="hljs-value">"stylesheet" <span class="hljs-attribute">href=<span class="hljs-value">"core.css"> <span class="hljs-comment"><!-- Avoid @imports --> <span class="hljs-tag"><<span class="hljs-title">style><span class="css"> <span class="hljs-at_rule">@<span class="hljs-keyword">import <span class="hljs-function">url(<span class="hljs-string">"more.css"); <span class="hljs-tag"></<span class="hljs-title">style> </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>
Introduce CSS and JavaScript files
- According to the HTML5 specification, there is usually no need to specify type when introducing CSS and JS, because text/css and text/javascript are their default values respectively
<span class="hljs-comment"><!-- External CSS --> <span class="hljs-tag"><<span class="hljs-title">link <span class="hljs-attribute">rel=<span class="hljs-value">"stylesheet" <span class="hljs-attribute">href=<span class="hljs-value">"code-guide.css"> <span class="hljs-comment"><!-- In-document CSS --> <span class="hljs-tag"><<span class="hljs-title">style><span class="css"> <span class="hljs-comment">/* ... */ <span class="hljs-tag"></<span class="hljs-title">style> <span class="hljs-comment"><!-- JavaScript --> <span class="hljs-tag"><<span class="hljs-title">script <span class="hljs-attribute">src=<span class="hljs-value">"code-guide.js"><span class="undefined"><span class="hljs-tag"></<span class="hljs-title">script> </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
2. Comments
Are the HTML tags and elements the same thing?Apr 28, 2025 pm 05:44 PMThe article explains that HTML tags are syntax markers used to define elements, while elements are complete units including tags and content. They work together to structure webpages.Character count: 159
What is the significance of <head> and <body> tag in HTML?Apr 28, 2025 pm 05:43 PMThe article discusses the roles of <head> and <body> tags in HTML, their impact on user experience, and SEO implications. Proper structuring enhances website functionality and search engine optimization.
What is the difference between <strong>, <b> tags and <em>, <i> tags?Apr 28, 2025 pm 05:42 PMThe article discusses the differences between HTML tags , , , and , focusing on their semantic vs. presentational uses and their impact on SEO and accessibility.
Please explain how to indicate the character set being used by a document in HTML?Apr 28, 2025 pm 05:41 PMArticle discusses specifying character encoding in HTML, focusing on UTF-8. Main issue: ensuring correct display of text, preventing garbled characters, and enhancing SEO and accessibility.
What are the various formatting tags in HTML?Apr 28, 2025 pm 05:39 PMThe article discusses various HTML formatting tags used for structuring and styling web content, emphasizing their effects on text appearance and the importance of semantic tags for accessibility and SEO.
What is the difference between the 'id' attribute and the 'class' attribute of HTML elements?Apr 28, 2025 pm 05:39 PMThe article discusses the differences between HTML's 'id' and 'class' attributes, focusing on their uniqueness, purpose, CSS syntax, and specificity. It explains how their use impacts webpage styling and functionality, and provides best practices for
What is the 'class' attribute in HTML?Apr 28, 2025 pm 05:37 PMThe article explains the HTML 'class' attribute's role in grouping elements for styling and JavaScript manipulation, contrasting it with the unique 'id' attribute.
What are different types of lists in HTML?Apr 28, 2025 pm 05:36 PMArticle discusses HTML list types: ordered (<ol>), unordered (<ul>), and description (<dl>). Focuses on creating and styling lists to enhance website design.
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