I recently saw a usage of structural pseudo-class selector on a foreign website. I thought it was very practical, so I tried it myself and recorded it:
This is the most basic style:
<span style="color: #008080;"> 1</span> <span style="color: #800000;"><style type="text/css">
</style></span><span style="color: #008080;"> 2</span> <span style="color: #800000;"> li</span>{
<span style="color: #008080;"> 3</span> <span style="color: #ff0000;"> list-style-type</span>:<span style="color: #0000ff;"> none</span>;
<span style="color: #008080;"> 4</span> <span style="color: #ff0000;"> float</span>:<span style="color: #0000ff;"> left</span>;
<span style="color: #008080;"> 5</span> <span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 60px</span>;
<span style="color: #008080;"> 6</span> <span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 60px</span>;
<span style="color: #008080;"> 7</span> <span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #979698</span>;
<span style="color: #008080;"> 8</span> <span style="color: #ff0000;"> margin-left</span>:<span style="color: #0000ff;"> 10px</span>;
<span style="color: #008080;"> 9</span> <span style="color: #ff0000;"> text-align</span>:<span style="color: #0000ff;"> center</span>;
<span style="color: #008080;">10</span> <span style="color: #ff0000;"> line-height</span>:<span style="color: #0000ff;"> 60px</span>;
<span style="color: #008080;">11</span> <span style="color: #ff0000;"> border-radius</span>:<span style="color: #0000ff;"> 50%</span>;
<span style="color: #008080;">13</span> }
<span style="color: #008080;">14</span> <span style="color: #800000;"></span>
Contents in body:
<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><span style="color: #800000;">ul</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第01个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 4</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第02个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 5</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第03个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 6</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第04个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 7</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第05个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 8</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第06个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 9</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第07个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">10</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第08个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">11</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第09个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">12</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第10个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">13</span> <span style="color: #0000ff;"><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>第11个<span style="color: #0000ff;"></span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span> <span style="color: #008080;">14</span> <span style="color: #0000ff;"></span><span style="color: #800000;">ul</span><span style="color: #0000ff;">></span> <span style="color: #008080;">15</span> <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
First is the usage of the most basic structural pseudo-class selector:
<span style="color: #008080;">1</span> <span style="color: #800000;"> li:nth-child(8)</span>{
<span style="color: #008080;">2</span> <span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #298EB2</span>;
<span style="color: #008080;">4</span> }
The results are displayed as:
Use:nth-child(n+6) which is equivalent to:nth-child(6) and above li tag elements:
<span style="color: #008080;">1</span> <span style="color: #800000;"> li:nth-child(n+6)</span>{
<span style="color: #008080;">2</span> <span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #298EB2</span>;
<span style="color: #008080;">4</span> }
The results are displayed as:
Similarly, use:nth-child(-n+6) which is equivalent to:nth-child(6) and the following li tag elements:
<span style="color: #008080;">1</span> <span style="color: #800000;"> li:nth-child(-n+6)</span>{
<span style="color: #008080;">2</span> <span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #298EB2</span>;
<span style="color: #008080;">4</span> }
The results are displayed as:
Based on the above principles we can come up with some advanced ones:
For example, you can use nth-child(n+4):nth-child(-n+8) to obtain the li tag elements of :nth-child(4) and above and :nth-child(8) and below:
<span style="color: #008080;">1</span> <span style="color: #800000;"> li:nth-child(n+4):nth-child(-n+8)</span>{
<span style="color: #008080;">2</span> <span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #298EB2</span>;
<span style="color: #008080;">3</span> }
The results are displayed as:
You can also use:nth-child(n+2):nth-child(odd):nth-child(-n+8) to get:nth-child(n+2) to:nth-child(-n+8 ) between singular li tag elements:
<span style="color: #008080;">1</span> <span style="color: #800000;"> li:nth-child(n+2):nth-child(odd):nth-child(-n+8)</span>{
<span style="color: #008080;">2</span> <span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #298EB2</span>;
<span style="color: #008080;">3</span> }
The results are displayed as:
Finally, we can also use:nth-child(3n+1) to get even li tag elements with numbers 1, 4, 7, and 10:
<span style="color: #008080;">1</span> <span style="color: #800000;"> li:nth-child(3n+1):nth-child(even)</span>{
<span style="color: #008080;">2</span> <span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #298EB2</span>;
<span style="color: #008080;">3</span> }
The results are displayed as:
The Future of HTML: Evolution and TrendsMay 13, 2025 am 12:01 AMThe future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.
Why are HTML attributes important for web development?May 12, 2025 am 12:01 AMHTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese
What is the purpose of the alt attribute? Why is it important?May 11, 2025 am 12:01 AMThe alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.
HTML, CSS, and JavaScript: Examples and Practical ApplicationsMay 09, 2025 am 12:01 AMThe roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.
How do you set the lang attribute on the tag? Why is this important?May 08, 2025 am 12:03 AMSetting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.
What is the purpose of HTML attributes?May 07, 2025 am 12:01 AMHTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform
How do you create a list in HTML?May 06, 2025 am 12:01 AMTocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.
HTML in Action: Examples of Website StructureMay 05, 2025 am 12:03 AMHTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
WebStorm Mac version
Useful JavaScript development tools
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
Notepad++7.3.1
Easy-to-use and free code editor
