bootstrap/site/content/docs/5.3/migration.md

layout, title, description, group, aliases, toc

layout	title	description	group	aliases	toc
docs	Migrating to v6	Track and review changes to the Bootstrap source files, documentation, and components to help you migrate from v5 to v6.	migration	/migration/	true

Guided migration

Helpers

• Ratios: Remove the parent wrapper element and apply the new .ratio-* utility directly to the element you want to modify. More info.

Changelog

Helpers

• Breaking Ratio helpers have been replaced by the aspect ratio utility.
  • Custom ratios via CSS variable are no longer supported, but you can still use the $aspect-ratios Sass map to customize the available ratios.
  • The .ratio-* utilities no longer apply to a parent wrapper—instead, place them directly on the element you want to modify.