Sticky stack

Coding soon

So much time searching all over the internet for such a simple thing. Pure CSS solution. Far from perfect but it looks nice.

Prevent headings overlap
Preserve sections spacing
Fixed sticky elements height (not nice)
Nested sections

stickstack html

<main class="page">
	<section>
		<h1>0 Main</h1>
		<p>Content</p>
		<section>
			<h2>1 One</h2>
			<p>Content</p>
			<section>
				<h3>1.1 One One</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
			<section>
				<h3>1.2 One Two</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
			<section>
				<h3>1.3 One Three</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
		</section>
		<section>
			<h2>2 Two</h2>
			<p>Content</p>
			<section>
				<h3>2.1 Two One</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
			<section>
				<h3>2.2 Two Two</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
		</section>
		<section>
			<h2>3 Three</h2>
			<p>Content</p>
			<section>
				<h3>3.1 Three One</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
			<section>
				<h3>3.2 Three Two</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
			<section>
				<h3>3.3 Three Three</h3>
				<section>
					<p>Content</p>
				</section>
			</section>
		</section>
	</section>
</main>

stickystack css

:root {
	--background: #ffffff;
	--text: #000000;

	--h1-height: 36px;
	--h2-height: 28px;
	--h3-height: 22px;
}

@media (prefers-color-scheme: dark) {
	:root {
		--background: #1a1a1a;
		--text: #bbbbbb;
	}
}

html {
	margin: 0;
	padding: 0;

	width: 100%;
	height: 100%;

	-webkit-text-size-adjust: 100%;
	-webkit-tap-highlight-color: transparent;
}

body {
	margin: 0;
	padding: 0;

	width: 100%;
	height: 100%;

	background: var(--background);
	color: var(--text);

	font-family: "Courier New", Courier, monospace;
}

h1 {
	font-size: 1.8em;
}

.page {
	box-sizing: border-box;
	width: 100%;
	max-width: 480px;
	margin: 0 auto;
	padding: 0 8px;
	z-index: 900;
	padding-top: 10%;
	padding-bottom: 100%;
}

.page section > h1,
.page section > h2,
.page section > h3 {
	position: sticky;
	background: var(--background);
	margin: 0;
	padding: 0 4px;
	display: flex;
	align-items: center;
	white-space: pre;
	text-overflow: ellipsis;
}

.page section > h1 {
	height: var(--h1-height);
	top: 0px;
	z-index: 10;
}

.page section > h2 {
	height: var(--h2-height);
	top: var(--h1-height);
	z-index: 9;
}

.page section > h3 {
	height: var(--h3-height);
	top: calc(var(--h1-height) + var(--h2-height));
	z-index: 8;
}

p {
	margin: 0;
	box-sizing: border-box;
	padding: 1.5em 0.3em 2.5em 0.3em;
}

stickystack js

window.addEventListener(
	"load", 
	() => 
		document.querySelectorAll("p")
		.forEach(
			p => {

				p.textContent = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
			
			}
		)
);