CSS Scroll Snap Slide Deck That Supports Live Coding

This article demonstrates creating a responsive, shareable, JavaScript-free slide deck using CSS scroll snap, ideal for live coding presentations, even in a live venue. The tutorial builds a CodePen-based deck with editable CSS demos, focusing on efficiency and accessibility.

Virtual presentations have revolutionized content delivery, offering presenters flexibility with multiple monitors for off-screen adjustments during live coding. This tutorial bridges the gap between virtual and in-person events by creating a comparable experience using only web standards and modern CSS.

Key techniques explored include CSS scroll snap, counters, grid layout, the contenteditable attribute, custom properties, HSL theming, gradient text, and styling the <style></style> element. Three slide templates are developed: Text, Title, and Demo (a split layout for code and preview).

The HTML structure utilizes an ordered list (<ol></ol>) with the ID "slides," each list item (<li>) representing a slide with appropriate class modifiers (e.g., slide--text, slide--title, slide--demo). The contenteditable attribute enables live editing of CSS within the demo slides.

Base styles establish a consistent look and feel using custom properties (--theme-hue, --theme-saturation) for color theming with HSL. Gradient backgrounds enhance the title slides. The demo slide incorporates a resizable .style container housing an inline <style></style> element for live-editable CSS, and a .demo container for the preview. The contenteditable="true" attribute on the <style></style> element is crucial for the live-coding functionality. Note that browser compatibility varies; Firefox offers the most complete live-editing support.

Code highlighting is achieved using linear-gradients and -webkit-text-fill-color and -webkit-background-clip properties, with custom properties controlling highlighted lines. Utility classes (highlight--rule-only, highlight--none) provide additional highlighting control.

CSS scroll snap (scroll-snap-type, scroll-snap-align, scroll-snap-stop) enables smooth, one-slide-at-a-time navigation. A media query adapts the layout for smaller viewports, switching from horizontal to vertical scrolling. Slide numbers are implemented using CSS counters and data attributes for enhanced visual organization.

The final slide deck is fully responsive and adaptable to various screen sizes, offering a seamless presentation experience across different devices and browsers. While full syntax highlighting requires JavaScript, this approach prioritizes simplicity and accessibility. The tutorial concludes with a link to a completed example and additional resources for further exploration of CSS scroll snap.

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