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145 lines
6.6 KiB
Markdown
145 lines
6.6 KiB
Markdown
---
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layout: docs
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title: Migrating to v5
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description: Track and review changes to the Bootstrap source files, documentation, and components to help you migrate from v4 to v5.
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group: migration
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aliases: "/migration/"
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toc: true
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---
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## Browser support
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See the browser and devices page for details on what is currently supported in Bootstrap 5. Since v4, here's what's changed to our browser support:
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- Dropped support for Internet Explorer NN
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- Dropped support for Firefox NN - MM
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- Dropped support for Safari NN
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- Dropped support for iOS Safari NN
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- Dropped support for Chrome NN
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- Dropped support for Android NN
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## Sass
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Changes to our source Sass files and compiled CSS.
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- Removed `hover`, `hover-focus`, `plain-hover-focus`, and `hover-focus-active` mixins. Use regular CSS syntax for these moving forward. [See #28267](https://github.com/twbs/bootstrap/pull/28267).
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- Remove previously deprecated mixins
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- `float()`
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- `form-control-mixin()`
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- `nav-divider()`
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- `retina-img()`
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- `text-hide()` (also dropped the associated utility class, `.text-hide`)
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- `visibility()`
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- **Todo:** New variables?
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- **Todo:** Rearrange forms source files (under `scss/forms/`)
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- **Todo:** Rearrange grid source files (under `scss/grid/`)
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- Removed print styles and `$enable-print-styles` variable. Print display classes, however, have remained intact. [See #28339](https://github.com/twbs/bootstrap/pull/28339).
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- Dropped `color()`, `theme-color()` & `gray()` functions in favor of variables. [See #29083](https://github.com/twbs/bootstrap/pull/29083)
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- The `theme-color-level()` function is renamed to `color-level()` and now accepts any color you want instead of only `$theme-color` colors. [See #29083](https://github.com/twbs/bootstrap/pull/29083)
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- Line heights are dropped from several components to simplify our codebase. The `button-size()` and `pagination-size()` do not accept line height parameters anymore. [See #29271](https://github.com/twbs/bootstrap/pull/29271)
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## JavaScript
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Changes to our source and compiled JavaScript files.
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- Dropped jQuery dependency and rewrote plugins to be in regular JavaScript.
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- Removed underscore from public static methods like `_getInstance()` → `getInstance()`.
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## Grid and layout
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Changes to any layout tools and our grid system.
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- Dropped `.media` component as it can be built with utility classes. [See #28265](https://github.com/twbs/bootstrap/pull/28265).
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- **Todo:** Remove `position: relative` from grid columns
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- **Todo:** Integrate CSS grid into our grid system
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## Content, Reboot, etc
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Changes to Reboot, typography, tables, and more.
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- **Todo:** Make RFS enabled by default
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- Reset default horizontal `padding-left` on `<ul>` and `<ol>` elements from browser default `40px` to `2rem`.
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- Simplified table styles (no more 2px border on `thead > th` elements) and tightened cell padding.
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- Dropped `.pre-scrollable` class. [See #29135](https://github.com/twbs/bootstrap/pull/29135)
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- `.text-*` utilities do not add hover and focus states to links anymore. `.link-*` helper classes can be used instead. [See #29267](https://github.com/twbs/bootstrap/pull/29267)
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## Forms
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- Rearranged form documentation under its own top-level section.
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- Split out old Forms page into several subpages
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- Moved input groups docs under new Forms section
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- Rearranged source Sass files under `scss/forms/`, including moving over input group styles.
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- Combined native and custom checkboxes and radios into single `.form-check` class.
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- New checks support sizing via `em`/`font-size` or explicit modifier classes now.
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- New checks now appear larger by default for improved usability.
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- Dropped `.custom-control` and associated classes.
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- Renamed most `$custom-control` variables to `$form-control` ones.
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- Combined native and custom selects into `.form-select`.
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- Dropped `.custom-select` and associated classes.
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- Renamed most `$custom-select` variables to `$form-select` ones.
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- Updated file input component with same overall design, but improved HTML.
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- Refactored `.form-file` markup to resolve some visual bugs while allowing translation and button text changes via HTML instead of CSS.
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- Dropped native `.form-control-file` and `.form-control-range` components entirely.
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- Renamed `.custom-file` to `.form-file` (including variables).
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- Added support for `:focus` and `:disabled` styles.
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- Renamed `.custom-range` to `.form-range` (including variables).
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- Dropped `.form-group` for margin utilities (we've replaced our docs examples with `.mb-3`).
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- Dropped support for `.form-control-plaintext` inside `.input-group`s.
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## Components
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### Alerts
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- **Todo:** Remove auto-darkening of `<hr>` elements in `.alert-*` class variants. `<hr>`s use `rgba()` for their color, so these should naturally blend anyway.
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### Badges
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Badges were overhauled to better differentiate themselves from buttons and to better utilize utility classes.
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- **Todo:** Removed and replaced `.badge` modifier classes with background utility classes (e.g., use `.bg-primary` instead of `.badge-primary`)
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- **Todo:** Removed `.badge-pill` for the `.rounded-pill` utility class
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- **Todo:** Removed badge's hover and focus styles for `a.badge` and `button.badge`.
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### Cards
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- Removed the card columns in favor of a Masonry grid [See #28922](https://github.com/twbs/bootstrap/pull/28922).
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### Icons (New!)
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- Added new Bootstrap icons to the project for our documentation, form controls, and more.
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- Removed Open Iconic icons from project source code for form controls.
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### Jumbotron
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- The jumbotron component is removed in favor of utility classes like `.bg-light` for the background color and `.p-*` classes to control padding.
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### Pagination
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- Pagination links now have customizable `margin-left` that are dynamically rounded on all corners when separated from one another.
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### Popovers
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- Renamed `.arrow` to `.popover-arrow`
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### Tooltips
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- Renamed `.arrow` to `.tooltip-arrow`
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## Accessibility
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- `.sr-only-focusable` does not require `.sr-only` anymore. [See #28720](https://github.com/twbs/bootstrap/pull/28720).
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## Utilities
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- Renamed `.text-monospace` to `.font-monospace`
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- Decreased the number of responsive order utilities per breakpoint. The highest order utility with a number now is `.order-5` instead of `.order-12`. [See #28874](https://github.com/twbs/bootstrap/pull/28874).
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- New `line-height` utilities: `.lh-1`, `.lh-sm`, `.lh-base` and `.lh-lg`. See [here]({{< docsref "/utilities/text#line-height" >}}).
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- **Todo:** Drop `.text-hide` as it's an antiquated method for hiding text that shouldn't be used anymore
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- **Todo:** Split utilities into property-value utility classes and helpers
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## Docs
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- Removed "Wall of browser bugs" page because it has become obsolete
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## Build tools
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