Drop-up submenu of vertical drop-down menu: implemented with pure CSS
For drop-down menu, transformed into drop -up menus are common, especially when the menu bar is at the bottom of the layout. To achieve this, we need to make some changes to the CSS styles.
Question: Convert drop-down menu to drop-up menu
Given drop-down menu CSS, how to modify the style so that it becomes drop -up menu?
Solution: Adjust #menu:hover ul li:hover ul rule
Can be done by adding bottom: 100%; attribute to #menu:hover ul li:hover ul rules to implement the drop-up function.
#menu:hover ul li:hover ul { position: absolute; margin-top: 1px; font: 10px; bottom: 100%; }
Optional improvement: only apply drop-up to top-level submenus
To prevent submenus from also applying drop-up For effect, you can add the following rules:
#menu>ul>li:hover>ul { bottom: 100%; }
Other considerations: Restore borders
Adding the bottom: 100%; attribute may remove the border of the submenu. To restore the border, you can add the following attributes:
#menu>ul>li:hover>ul { bottom: 100%; border-bottom: 1px solid transparent }
Demonstration
Here are some examples that demonstrate this technique:
- [ Demo 1](https://jsfiddle.net/W5FWW/4/)
- [Demo 2](https://jsfiddle.net/zyp6c/)
- [Demo 3](https ://jsfiddle.net/phkj20zo/)
The above is the detailed content of How to Transform a CSS Drop-Down Menu into a Drop-Up Menu?. For more information, please follow other related articles on the PHP Chinese website!

Hot 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

Hot 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

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.

To deal with CSS browser compatibility and prefix issues, you need to understand the differences in browser support and use vendor prefixes reasonably. 1. Understand common problems such as Flexbox and Grid support, position:sticky invalid, and animation performance is different; 2. Check CanIuse confirmation feature support status; 3. Correctly use -webkit-, -moz-, -ms-, -o- and other manufacturer prefixes; 4. It is recommended to use Autoprefixer to automatically add prefixes; 5. Install PostCSS and configure browserslist to specify the target browser; 6. Automatically handle compatibility during construction; 7. Modernizr detection features can be used for old projects; 8. No need to pursue consistency of all browsers,

Setting the style of links you have visited can improve the user experience, especially in content-intensive websites to help users navigate better. 1. Use CSS's: visited pseudo-class to define the style of the visited link, such as color changes; 2. Note that the browser only allows modification of some attributes due to privacy restrictions; 3. The color selection should be coordinated with the overall style to avoid abruptness; 4. The mobile terminal may not display this effect, and it is recommended to combine it with other visual prompts such as icon auxiliary logos.

Use the clip-path attribute of CSS to crop elements into custom shapes, such as triangles, circular notches, polygons, etc., without relying on pictures or SVGs. Its advantages include: 1. Supports a variety of basic shapes such as circle, ellipse, polygon, etc.; 2. Responsive adjustment and adaptable to mobile terminals; 3. Easy to animation, and can be combined with hover or JavaScript to achieve dynamic effects; 4. It does not affect the layout flow, and only crops the display area. Common usages are such as circular clip-path:circle (50pxatcenter) and triangle clip-path:polygon (50%0%, 100 0%, 0 0%). Notice

Themaindifferencesbetweendisplay:inline,block,andinline-blockinHTML/CSSarelayoutbehavior,spaceusage,andstylingcontrol.1.Inlineelementsflowwithtext,don’tstartonnewlines,ignorewidth/height,andonlyapplyhorizontalpadding/margins—idealforinlinetextstyling

To create responsive images using CSS, it can be mainly achieved through the following methods: 1. Use max-width:100% and height:auto to allow the image to adapt to the container width while maintaining the proportion; 2. Use HTML's srcset and sizes attributes to intelligently load the image sources adapted to different screens; 3. Use object-fit and object-position to control image cropping and focus display. Together, these methods ensure that the images are presented clearly and beautifully on different devices.

CSS,orCascadingStyleSheets,isthepartofwebdevelopmentthatcontrolsawebpage’svisualappearance,includingcolors,fonts,spacing,andlayout.Theterm“cascading”referstohowstylesareprioritized;forexample,inlinestylesoverrideexternalstyles,andspecificselectorslik

TheCSSPaintingAPIenablesdynamicimagegenerationinCSSusingJavaScript.1.DeveloperscreateaPaintWorkletclasswithapaint()method.2.TheyregisteritviaregisterPaint().3.ThecustompaintfunctionisthenusedinCSSpropertieslikebackground-image.Thisallowsfordynamicvis
