• <strike id="mq8ow"></strike><small id="mq8ow"><option id="mq8ow"></option></small>
    <\/pre>\n
    .a {\n  margin-top: auto;\n  position: sticky;\n  bottom: 0;\n}\n\n.b {\n  position: sticky;\n  top: 0;\n}<\/pre>\n

    In this example, element A starts as relative and becomes fixed when scrolled down. Element B, on the other hand, starts as fixed and becomes relative when scrolled up. This behavior aligns with the actual behavior described above, where bottom: 0 results in fixed positioning at the outset.<\/p>"}

    国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

    Home Web Front-end CSS Tutorial Why Does `bottom: 0` in Sticky Positioning Act Opposite to Expectations?

    Why Does `bottom: 0` in Sticky Positioning Act Opposite to Expectations?

    Nov 26, 2024 pm 06:37 PM

    Why Does `bottom: 0` in Sticky Positioning Act Opposite to Expectations?

    Unexpected Behavior with Sticky Positioning: bottom: 0

    In exploring the CSS position property, developers may encounter an unexpected behavior when specifying bottom: 0 for sticky positioning. According to the MDN documentation, sticky elements are initially treated as relative position elements until a specified threshold is met, at which point they switch to fixed positioning. However, when bottom: 0 is specified, the opposite behavior occurs.

    Expected Behavior vs. Actual Behavior

    The MDN documentation suggests that elements with bottom: 0 should be relative when below the viewport and fixed when above it. However, the actual behavior is reversed: elements are fixed when below the viewport and relative when above it.

    Explanation

    This discrepancy stems from the wording of the MDN documentation. It states that sticky elements are treated as relative until the threshold is exceeded, not necessarily starting as relative. In the case of bottom: 0, the threshold is effectively exceeded from the start, as the element begins below the bottom of the viewport. Therefore, the element starts as fixed and becomes relative when scrolled beyond its starting point.

    Example Illustration

    Consider the following HTML and CSS code:

    <body>
    .a {
      margin-top: auto;
      position: sticky;
      bottom: 0;
    }
    
    .b {
      position: sticky;
      top: 0;
    }

    In this example, element A starts as relative and becomes fixed when scrolled down. Element B, on the other hand, starts as fixed and becomes relative when scrolled up. This behavior aligns with the actual behavior described above, where bottom: 0 results in fixed positioning at the outset.

    The above is the detailed content of Why Does `bottom: 0` in Sticky Positioning Act Opposite to Expectations?. For more information, please follow other related articles on the PHP Chinese website!

    Statement of this Website
    The 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.cn

    Hot AI Tools

    Undress AI Tool

    Undress AI Tool

    Undress images for free

    Undresser.AI Undress

    Undresser.AI Undress

    AI-powered app for creating realistic nude photos

    AI Clothes Remover

    AI Clothes Remover

    Online AI tool for removing clothes from photos.

    Clothoff.io

    Clothoff.io

    AI clothes remover

    Video Face Swap

    Video Face Swap

    Swap faces in any video effortlessly with our completely free AI face swap tool!

    Hot Tools

    Notepad++7.3.1

    Notepad++7.3.1

    Easy-to-use and free code editor

    SublimeText3 Chinese version

    SublimeText3 Chinese version

    Chinese version, very easy to use

    Zend Studio 13.0.1

    Zend Studio 13.0.1

    Powerful PHP integrated development environment

    Dreamweaver CS6

    Dreamweaver CS6

    Visual web development tools

    SublimeText3 Mac version

    SublimeText3 Mac version

    God-level code editing software (SublimeText3)

    CSS tutorial for creating loading spinners and animations 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.

    Addressing CSS Browser Compatibility issues and prefixes Addressing CSS Browser Compatibility issues and prefixes Jul 07, 2025 am 01:44 AM

    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,

    Styling visited links differently with CSS Styling visited links differently with CSS Jul 11, 2025 am 03:26 AM

    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.

    Creating custom shapes with css clip-path Creating custom shapes with css clip-path Jul 09, 2025 am 01:29 AM

    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

    What is the difference between display: inline, display: block, and display: inline-block? What is the difference between display: inline, display: block, and display: inline-block? Jul 11, 2025 am 03:25 AM

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

    What is the CSS Painting API? What is the CSS Painting API? Jul 04, 2025 am 02:16 AM

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

    How to create responsive images using CSS? How to create responsive images using CSS? Jul 15, 2025 am 01:10 AM

    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.

    What are common CSS browser inconsistencies? What are common CSS browser inconsistencies? Jul 26, 2025 am 07:04 AM

    Different browsers have differences in CSS parsing, resulting in inconsistent display effects, mainly including the default style difference, box model calculation method, Flexbox and Grid layout support level, and inconsistent behavior of certain CSS attributes. 1. The default style processing is inconsistent. The solution is to use CSSReset or Normalize.css to unify the initial style; 2. The box model calculation method of the old version of IE is different. It is recommended to use box-sizing:border-box in a unified manner; 3. Flexbox and Grid perform differently in edge cases or in old versions. More tests and use Autoprefixer; 4. Some CSS attribute behaviors are inconsistent. CanIuse must be consulted and downgraded.

    See all articles