css three-level menu
Pure css three-level menu effect
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The website has a second-level menu. How to use CSS to display a third-level menu under the second-level menu. Ask for help from well-intentioned people.

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To create a CSS navigation menu, first build the structure using HTML's nav elements and an unordered list, then implement horizontal layout through Flexbox, and add hover effects and responsive design. 1. Use semantic HTML structures to include nav, ul, li and a tags; 2. Use Flexbox to set display:flex, gap and list-style:none to achieve horizontal arrangement; 3. Add link styles, hover effects, transition animations and focus states; 4. Use media query to adjust the flex-direction under the small screen to column to achieve vertical stacking layout. The whole process is simple and clear, suitable for mastering basic layout techniques.

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How to determine whether the uploaded menu to the second-level page is the first-level menu or the second-level menu?

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Key Points A maintainable CSS architecture is essential to avoid difficult-to-maintain stylesheets, as difficult-to-maintain stylesheets can have unexpected side effects and require a thorough rewrite of the application's CSS. Three basic concepts or pillars form the cornerstone of CSS architecture design: building blocks (such as Sass, efficient CSS selectors, BEM syntax, etc.), orchestrating these building blocks into reliable and maintainable hierarchical CSS, and software engineering principles Application. Software engineering principles such as separation of concerns and SOLID principles can be applied to CSS to ensure that code models reality in a maintainable way. This includes applying principles such as DRY (don't repeat yourself) and WET (we like to type) to improve the maintainability of the code

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