Contact person: Parallax Background Switch on Scroll

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Location: birmingham, United Kingdom

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I’m refreshing my personal blog and want visitors to experience a smooth parallax reveal as they read. The idea is simple: while the article text scrolls, four full-width background images stay fixed in place, replacing one another at key points in the page. The text should glide over each photo, creating that subtle depth you get when content moves but the backdrop feels anchored.

At the end of the 4 pictures the text boxes that are already on the page come into view.
The page I built using AI allowed the content to shift left-right, that must not happen.

The page is nearly complete.

I want to be able to adjust the amount of text at will and the pictures change at <DIV id="xx"> points.


Here’s what I need from you: clean HTML, CSS and vanilla JavaScript (or lightweight ES6) that I can drop into an existing page. The code should detect scroll position, keep the background layer fixed, and swap the three images in sequence without any flicker or jank. I don’t want a heavy framework—just efficient, readable code that degrades gracefully on mobile.

Please include brief comments in the files so I can tweak image URLs or timing later, plus a short note explaining where each snippet slots into the header and body. When I paste your work into my blog template, the effect should run immediately with no additional setup." (client-provided description)