1. Design System
2. What's new
3. Release notes

Release notes

What changed in each release.

What changed in each release.

July 9, 2026

v1.4.0

• Added expand text, details, accordion and an experimental service switcher pattern.
• Added a caps utility.
• Updated heading levels 1 and 2 to scale down slightly relative to screen size.
• Updated checkboxes to use a slightly larger consistent default size.

May 4, 2026

v1.3.1

• Updated the feedback pattern to render more consistently.

April 20, 2026

v1.3.0

• Added a button, link, and callout pattern.
• Updated the footer phone number.

March 31, 2026

v1.2.1

• Improved narrow viewport layout and single page app routing behavior of the feedback.

March 16, 2026

v1.2.0

• Added a feedback, IIIF image, and page title pattern.
• Added an opt-in show-built-with prop to the footer pattern.
• Changed serif font to Perpetua.

November 14, 2025

v1.1.0

• Added an autocomplete pattern.

September 10, 2025

v1.0.0

• Added a description list and results per page pattern.
• Added a writing for users how-to.
• Added CSS utilities section to build digital spaces how-to.
• Changed CSS custom properties and classes to be prefixed with pl to avoid naming collisions.

Examples:

<div class="pl-viewport-margins">
  ...
</div>

pennlibs-header {
  --pl-viewport-margins-max-width: 1080px; /* default is 1440px */
  --pl-viewport-margins-gutters: 1.5em; /* default is 1rem or 3rem when min-width is 768px */
}

June 17, 2025

v0.3.1

• Update the CSS class .viewport-margins left and right padding to be 1rem for all screen sizes, as it used to be.

June 16, 2025

v0.3.0

• Added Hero: Place your most important content in a prominent space, often at the top of your website.
• Added Fallback image: Maintain visual consistency in layouts when some content lacks images.
• Added this documentation website.