Home Web Front-end CSS Tutorial What Happens to Absolutely Positioned Elements with No Explicit Top, Left, Bottom, or Right Values?

What Happens to Absolutely Positioned Elements with No Explicit Top, Left, Bottom, or Right Values?

Nov 07, 2024 pm 06:16 PM

What Happens to Absolutely Positioned Elements with No Explicit Top, Left, Bottom, or Right Values?

Understanding Default Position Values for Absolute Positioning

In CSS, when an element is positioned absolutely, its coordinates are specified relative to its containing block. However, what happens when no explicit values are provided for the top, left, bottom, or right properties? To unravel this mystery, let's examine the default values and their implications.

As expected, the default value for all these properties is not zero, but rather "auto". According to the CSS specification (Section 9.3.2), when all offsets are set to auto for an absolutely positioned box, it remains in its original position as if it were not positioned at all.

This concept becomes clearer in Section 10.3.7 of the spec, which dictates that when all three of left, width, and right are auto, the left property is resolved first. If the element's directionality is left-to-right ('ltr'), left is set to the static position; otherwise, right is set to the static position

Similarly, Section 10.6.4 governs vertical dimension constraints for absolutely positioned elements. If top, height, and bottom are all auto, the top property is assigned the static position by default.

In practical terms, this means that an absolutely positioned element without any explicit coordinate values will remain where it would have been normally positioned, without any shifts in its location. This is known as the "static position".

To summarize, when no specific values are specified for the top, left, bottom, or right properties of an absolutely positioned element, they assume the default value of auto, which effectively retains the element's original position within its container.

The above is the detailed content of What Happens to Absolutely Positioned Elements with No Explicit Top, Left, Bottom, or Right Values?. 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 Article Tags

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)

Adding Box Shadows to WordPress Blocks and Elements Adding Box Shadows to WordPress Blocks and Elements Mar 09, 2025 pm 12:53 PM

Adding Box Shadows to WordPress Blocks and Elements

Create a JavaScript Contact Form With the Smart Forms Framework Create a JavaScript Contact Form With the Smart Forms Framework Mar 07, 2025 am 11:33 AM

Create a JavaScript Contact Form With the Smart Forms Framework

Create an Inline Text Editor With the contentEditable Attribute Create an Inline Text Editor With the contentEditable Attribute Mar 02, 2025 am 09:03 AM

Create an Inline Text Editor With the contentEditable Attribute

Working With GraphQL Caching Working With GraphQL Caching Mar 19, 2025 am 09:36 AM

Working With GraphQL Caching

Making Your First Custom Svelte Transition Making Your First Custom Svelte Transition Mar 15, 2025 am 11:08 AM

Making Your First Custom Svelte Transition

Comparing the 5 Best PHP Form Builders (And 3 Free Scripts) Comparing the 5 Best PHP Form Builders (And 3 Free Scripts) Mar 04, 2025 am 10:22 AM

Comparing the 5 Best PHP Form Builders (And 3 Free Scripts)

File Upload With Multer in Node.js and Express File Upload With Multer in Node.js and Express Mar 02, 2025 am 09:15 AM

File Upload With Multer in Node.js and Express

Best CSS Animations and Effects on CodeCanyon 2025 (Paid   Free) Best CSS Animations and Effects on CodeCanyon 2025 (Paid Free) Mar 01, 2025 am 09:32 AM

Best CSS Animations and Effects on CodeCanyon 2025 (Paid Free)

See all articles