What is the impact of using high z-index values in CSS on performance?
If a webpage contains multiple images, does setting z-index values as high as 10,000 affect performance?
For instance, if a page has 15 images with z-indexes ranging from 500 to 10,000, and these images are draggable using jQuery, will using such high values impact performance when the page is redrawn frequently?
The quantity of layers is significant, however, the specific z-index value is not. During the page rendering process, the browser simply organizes all absolutely positioned elements based on their z-index (in ascending order) and displays them in that sequence.
UPDATE: Additionally, the processing delay caused by sorting only occurs when you modify the z-index values of the layers. If the z-indices remain relatively stable, the performance impact may be minimal or undetectable. Even if there are frequent changes to the z-indices, sorting a list with a limited number of items is nearly instantaneous.
When considering high z-index numbers in web design, it's important to keep in mind that 2147483647 is the maximum value supported by most web browsers due to its limit as a 32-bit integer. Any z-index number higher than this will automatically default back to 2147483647.
This information is crucial for understanding the limitations of z-index in CSS and how it can impact the performance of your website.
Resource: https://wordpress.org/support/topic/css-reference-to-the-tinymce-absolute-position-handle
Absolutely. It can be challenging to determine the extent of the impact without examining the entire page, but there are certainly performance issues at play here. When you manipulate Z index and use jQuery or other libraries to dynamically select and modify DOM elements, you're essentially reorganizing the structure of HTML components. It's important to note that browsers don't inherently understand what MODAL means. So, any changes to the layout prompt the browser to recalculate the DOM, resulting in a hit to performance.
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