The parallax scrolling effect can be achieved through CSS, and the core is to make the background and content scrolling speed different. Specific methods: 1. Use background-attachment: fixed to achieve basic parallax; 2. Use a hierarchical structure to control the scrolling speed of each layer; 3. Pay attention to performance optimization, mobile adaptation and reasonable use of hierarchical effects to improve the experience.
It is actually not difficult to do parallax scrolling effect, and using CSS can solve some basic implementation. The key is to understand the principle of parallax scrolling and how to use the difference between background images and scrolling speed to create a sense of hierarchy.
What is parallax scrolling?
Simply put, when the page is scrolling, the foreground and background move at different speeds, forming a three-dimensional dynamic feeling. This effect is often used in web design to enhance the visual experience, especially suitable for introduction pages, portfolios or story-based pages.
The core idea of realizing it is: make the background image move a little slower than the content, or vice versa . This looks like different layers are moving "staggered".
Basic implementation method: use background-attachment
This is the easiest way to implement it, no JavaScript is required, only a few CSS properties:
.section {
height: 100vh;
background-image: url('your-image.jpg');
background-attachment: fixed; /* key points*/
background-size: cover;
}-
background-attachment: fixedmakes the background image fixed, while the content slides through it, creating parallax. - Use with multiple
.section, each setting a different background image can create a multi-layer scrolling effect.
Note: This method has good compatibility, but the performance of
fixedon some mobile browsers (such as iOS Safari) may not be as expected, and the background image will follow.
More flexible approach: hierarchical structure background-position
If you want more granular control, you can manually divide the background and content into multiple layers, and simulate parallax by setting different scrolling speeds.
The HTML structure is roughly like this:
<div class="parallax"> <div class="layer background"></div> <div class="layer content">This is the text</div> </div>
CSS controls the background layer scrolling speed:
.parallax {
position: relative;
overflow: hidden;
height: 100vh;
}
.layer.background {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 200%;
background-image: url('bg.jpg');
background-size: cover;
transform: translateY(0);
transition: transform 0.1s;
}
/* JS modify the location of the background layer while scrolling*/Then use a little JavaScript to listen for scrolling events and change the location of the background layer:
window.addEventListener("scroll", function () {
const scroll = window.scrollY;
document.querySelector(".layer.background").style.transform = `translateY(${scroll * 0.5}px)`;
});- Here
scroll * 0.5means that the background layer moves only half the distance, forming a parallax. - You can add more layers and set different coefficients for each layer to create richer effects.
Parallax scrolling FAQs and suggestions
- Performance : Try to avoid using too many large images, otherwise the page will load slowly and scrolling will be stuttered.
- Mobile adaptation : Some mobile browsers do not support
background-attachment: fixed, so it is recommended to test in advance. - Semantic structure : Although a hierarchical structure is used, the content order should still be reasonable to ensure barrier-free access.
- Don't overuse : parallax scrolling can easily make people show off their skills, but if each screen moves around, it will affect the reading experience.
Basically all of this is not complicated to implement, but details are easy to ignore, especially compatibility and performance control. You can first use background-attachment to quickly implement a version, and then add JS dynamic control as needed.
The above is the detailed content of Implementing parallax scrolling effects with css. For more information, please follow other related articles on the PHP Chinese website!
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