Div as a Direct Child of UL: A Careful Approach
In HTML, it's commonly believed that only the
- element. However, some sources seem to suggest that
-
HTML 4: The content model for
- explicitly states that it can only contain
- elements:
<!ELEMENT UL - - (LI) + -- unordered list -- >
-
HTML 5: The content model for
- similarly specifies only
- elements:
Content model: Zero or more li elements.
Interpretation
The content model specifications clearly indicate that the only valid child of
- is
- . Therefore, according to the official HTML standards, using as a direct child of
- is incorrect.
- elements as direct children of
- . Using
or any other element as a child violates the HTML specifications and can have performance implications. By adhering to the standards, developers can ensure both the validity and optimal performance of their HTML code.The above is the detailed content of Can a `` Element Be a Direct Child of a `` Element in HTML?. For more information, please follow other related articles on the PHP Chinese website!
Browser Rendering Considerations
While some browsers may render
as a direct child of- without any apparent errors, this is not a reliable indicator of its validity. Browsers may often tolerate code that does not strictly adhere to the specifications, but this does not make it correct.
Performance Implications
Using
as a child of- can also have performance implications. Browsers internally process HTML elements according to the specified content models. When the content model is violated, the browser may need to perform additional work to handle the unexpected element, potentially slowing down the page's loading time.
Conclusion
In summary, the correct HTML structure for an unordered list is to use only
Statement of this WebsiteThe content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cnHot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Oguri Cap Build Guide | A Pretty Derby Musume3 weeks ago By Jack chenAgnes Tachyon Build Guide | A Pretty Derby Musume3 weeks ago By Jack chenGrass Wonder Build Guide | Uma Musume Pretty Derby2 weeks ago By Jack chenHow to Fix KB5060829 Not Installing & Other Reported Bugs3 weeks ago By DDDOwn a Fish Pond codes June 20253 weeks ago By Jack chenHot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Java Tutorial1793
16
CakePHP Tutorial1737
56
Laravel Tutorial1588
29
nyt mini crossword answers267
587
What is Autoprefixer and how does it work? Jul 02, 2025 am 01:15 AM
Autoprefixer is a tool that automatically adds vendor prefixes to CSS attributes based on the target browser scope. 1. It solves the problem of manually maintaining prefixes with errors; 2. Work through the PostCSS plug-in form, parse CSS, analyze attributes that need to be prefixed, and generate code according to configuration; 3. The usage steps include installing plug-ins, setting browserslist, and enabling them in the build process; 4. Notes include not manually adding prefixes, keeping configuration updates, prefixes not all attributes, and it is recommended to use them with the preprocessor.
CSS tutorial for creating a sticky header or footer Jul 02, 2025 am 01:04 AM
TocreatestickyheadersandfooterswithCSS,useposition:stickyforheaderswithtopvalueandz-index,ensuringparentcontainersdon’trestrictit.1.Forstickyheaders:setposition:sticky,top:0,z-index,andbackgroundcolor.2.Forstickyfooters,betteruseposition:fixedwithbot
What is the conic-gradient() function? Jul 01, 2025 am 01:16 AM
Theconic-gradient()functioninCSScreatescirculargradientsthatrotatecolorstopsaroundacentralpoint.1.Itisidealforpiecharts,progressindicators,colorwheels,anddecorativebackgrounds.2.Itworksbydefiningcolorstopsatspecificangles,optionallystartingfromadefin
What is the scope of a CSS Custom Property? Jun 25, 2025 am 12:16 AM
The scope of CSS custom properties depends on the context of their declaration, global variables are usually defined in :root, while local variables are defined within a specific selector for componentization and isolation of styles. For example, variables defined in the .card class are only available for elements that match the class and their children. Best practices include: 1. Use: root to define global variables such as topic color; 2. Define local variables inside the component to implement encapsulation; 3. Avoid repeatedly declaring the same variable; 4. Pay attention to the coverage problems that may be caused by selector specificity. Additionally, CSS variables are case sensitive and should be defined before use to avoid errors. If the variable is undefined or the reference fails, the fallback value or default value initial will be used. Debug can be done through the browser developer
CSS tutorial focusing on mobile-first design Jul 02, 2025 am 12:52 AM
Mobile-firstCSSdesignrequiressettingtheviewportmetatag,usingrelativeunits,stylingfromsmallscreensup,optimizingtypographyandtouchtargets.First,addtocontrolscaling.Second,use%,em,orreminsteadofpixelsforflexiblelayouts.Third,writebasestylesformobile,the
CSS tutorial for creating loading spinners and animations Jul 07, 2025 am 12:07 AM
There are three ways to create a CSS loading rotator: 1. Use the basic rotator of borders to achieve simple animation through HTML and CSS; 2. Use a custom rotator of multiple points to achieve the jump effect through different delay times; 3. Add a rotator in the button and switch classes through JavaScript to display the loading status. Each approach emphasizes the importance of design details such as color, size, accessibility and performance optimization to enhance the user experience.
How to center an entire grid within the viewport? Jul 02, 2025 am 12:53 AM
To make the entire grid layout centered in the viewport, it can be achieved by the following methods: 1. Use margin:0auto to achieve horizontal centering, and the container needs to be set to set the fixed width, which is suitable for fixed layout; 2. Use Flexbox to set the justify-content and align-items properties in the outer container, and combine min-height:100vh to achieve vertical and horizontal centering, which is suitable for full-screen display scenarios; 3. Use CSSGrid's place-items property to quickly center on the parent container, which is simple and has good support from modern browsers, and at the same time, it is necessary to ensure that the parent container has sufficient height. Each method has applicable scenarios and restrictions, just choose the appropriate solution according to actual needs.
How to create an intrinsically responsive grid layout? Jul 02, 2025 am 01:19 AM
To create an intrinsic responsive grid layout, the core method is to use CSSGrid's repeat(auto-fit,minmax()) mode; 1. Set grid-template-columns:repeat(auto-fit,minmax(200px,1fr)) to let the browser automatically adjust the number of columns and limit the minimum and maximum widths of each column; 2. Use gap to control grid spacing; 3. The container should be set to relative units such as width:100%, and use box-sizing:border-box to avoid width calculation errors and center them with margin:auto; 4. Optionally set the row height and content alignment to improve visual consistency, such as row
- elements as direct children of
- elements:
- elements:
HTML 4 and 5 Specifications
Let's examine the HTML 4 and 5 specifications to clarify this issue.