Feat: Add container queries to bootstrap #41612
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This change is designed to be backward compatible with the existing media query implementation, while also enabling support for container queries.
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Description
Container queries implementation for Bootstrap.
This change is designed to be backward compatible with the existing media query implementation, while also enabling support for container queries.
Motivation & Context
Bootstrap uses media queries for responsive design, which are based on the browser's viewport. However, this approach has limitations. For example, if a component is initially designed for the main content area and later reused inside a smaller container, the media queries still respond only to the overall viewport size, not the size of the component’s parent container. This means the layout may not adapt correctly in different contexts. See the image below for a visual example.
If I display the course overview in a side panel. Instead of adapting to the narrower space and showing just one item per line, it still uses the browser viewport width and continues to display multiple items, which can break the layout.
With Container Queries, this limitation is eliminated because breakpoints can now be applied relative to the size of a specific container, rather than the entire browser viewport.
Expectations
This is my first time opening a PR in Bootstrap and I'm not sure if submitting a PR is the best approach. That said, I believe the lack of Container Query support is a challenge many developers are currently facing and before turning to custom CSS solutions or maintaining a personal fork of Bootstrap, I wanted to ask whether this approach could be considered for inclusion or if there are any existing plans to support Container Queries soon. I'd also appreciate any feedback or guidance.
Technical details
The linked issue includes several comments and alternative suggestions for addressing this problem. The approach in this PR closely follows @Joniras's approach, the idea is to literally replace media queries with content queries and add
container-type: inline-sizeto the root element, this way and unless the size of the<html>element is modified, Bootstrap will behave just like it does with media queries because the<html>width should match the viewport width. This ensures backward compatibility for existing sites while enabling developers to opt in to container-based breakpoints by simply adding thebreakpoint-containerclass to the desired element.Compatibility
Container Queries have been supported in all major browsers for years.
Type of changes
Checklist
npm run lint)Related issues
Linked Issue: #37807