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Bootstrap/site/content/docs/4.3/migration.md

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docs Migrating to v5 Track and review changes to the Bootstrap source files, documentation, and components to help you migrate from v4 to v5. migration /migration/ true

Browser support

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:

  • Dropped support for Internet Explorer 10 and 11
  • Dropped support for Firefox NN - MM
  • Dropped support for Safari NN
  • Dropped support for iOS Safari NN
  • Dropped support for Chrome NN
  • Dropped support for Android NN

Sass

Changes to our source Sass files and compiled CSS.

  • Removed hover, hover-focus, plain-hover-focus, and hover-focus-active mixins. Use regular CSS syntax for these moving forward. See #28267.
  • Remove previously deprecated mixins
    • float()
    • form-control-mixin()
    • nav-divider()
    • retina-img()
    • text-hide() (also dropped the associated utility class, .text-hide)
    • visibility()
    • form-control-focus()
  • Todo: New variables?
  • Todo: Rearrange forms source files (under scss/forms/)
  • Todo: Rearrange grid source files (under scss/grid/)
  • Removed print styles and $enable-print-styles variable. Print display classes, however, have remained intact. See #28339.
  • Dropped color(), theme-color() & gray() functions in favor of variables. See #29083
  • 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
  • $enable-grid-classes doesn't disable the generation of container classes anymore See #29146
  • Renamed $enable-prefers-reduced-motion-media-query and $enable-pointer-cursor-for-buttons to $enable-reduced-motion and $enable-button-pointers for brevity.
  • 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
  • The button-variant() mixin now accepts 3 optional color parameters, for each button state, to override the color provided by color-contrast(). By default, these parameters will find which color provides more contrast against the button state's background color with color-contrast().
  • The button-outline-variant() mixin now accepts an additional argument, $active-color, for setting the button's active state text color. By default, this parameter will find which color provides more contrast against the button's active background color with color-contrast().
  • Ditch the Sass map merges, which makes it easier to remove redundant values. Keep in mind you now have to define all values in the Sass maps like $theme-colors. Check out how to deal with [Sass maps]({{< docsref "/customize/sass#maps-and-loops" >}}).
  • color-yiq() function and related variables are renamed to color-contrast() since it's not related to YIQ colorspace anymore. See #30168.
    • $yiq-contrasted-threshold is renamed $min-contrast-ratio.
    • $yiq-text-dark and $yiq-text-light are respectively renamed $color-contrast-dark and $color-contrast-light.

JavaScript

Changes to our source and compiled JavaScript files.

  • Dropped jQuery dependency and rewrote plugins to be in regular JavaScript.
  • Removed underscore from public static methods like _getInstance() → getInstance().

Color system

We've updated the color system that powers Bootstrap to improve color contrast and provide a much more extensive set of colors.

  • Updated blue and pink base colors (-500) to ensure AA contrast.
  • Added new tints and shades for every color, providing nine separate colors for each base color, as new Sass variables.
  • To support our color system, we've added new custom tint-color() and shade-color() functions to mix our colors appropriately.

Grid and layout

Changes to any layout tools and our grid system.

  • Dropped .media component as it can be built with utility classes. See #28265.
  • Remove position: relative from grid columns.
  • The horizontal padding is added to the direct children in a row instead of the columns themselves.
    • This simplifies our codebase.
    • The column classes can now be used stand alone. Whenever they are used outside a .row, horizontal padding won't be added.
  • Responsive gutter classes can be used to control the gutter width in as well horizontal, vertical or both directions.
  • The gutter width is now set in rem and decreased from 30px to 1.5rem (24px).
  • bootstrap-grid.css now only applies box-sizing: border-box to the column instead of resetting the global box-sizing. This way the grid system can be used, even if box-sizing: border-box in not applied to each element.

Content, Reboot, etc

Changes to Reboot, typography, tables, and more.

  • [RFS]({{< docsref "/getting-started/rfs" >}}) enabled for automated font size rescaling. See #29152
  • Reset default horizontal padding-left on <ul> and <ol> elements from browser default 40px to 2rem.
  • Simplified table styles (no more odd top border) and tightened cell padding.
  • Nested tables do not inherit styles anymore.
  • .thead-light and .thead-dark are dropped in favor of the .table-* variant classes which can be used for all table elements (thead, tbody, tfoot, tr, th and td).
  • The table-row-variant() mixin is renamed to table-variant() and accepts only 2 parameters: $color (colon name) and $value (color code). The border color and accent colors are automatically calculated based on the table factor variables.
  • Dropped .pre-scrollable class. See #29135
  • .text-* utilities do not add hover and focus states to links anymore. .link-* helper classes can be used instead. See #29267
  • Drop .text-justify class. See #229793

Typography

  • Removed $display-* variables for a new $display-font-sizes Sass map.
  • Removed individiual $display-*-weight variables for a single $display-font-weight.
  • Added two new .display-* heading styles, .display-5 and .display-6.
  • Resized existing display headings for a slightly more consistent set of font-sizes.

Forms

  • Rearranged form documentation under its own top-level section.
    • Split out old Forms page into several subpages
    • Moved input groups docs under new Forms section
  • Rearranged source Sass files under scss/forms/, including moving over input group styles.
  • Combined native and custom checkboxes and radios into single .form-check class.
    • New checks support sizing via em/font-size or explicit modifier classes now.
    • New checks now appear larger by default for improved usability.
    • Dropped .custom-control and associated classes.
    • Renamed most $custom-control variables to $form-control ones.
  • Combined native and custom selects into .form-select.
    • Dropped .custom-select and associated classes.
    • Renamed most $custom-select variables to $form-select ones.
  • Updated file input component with same overall design, but improved HTML.
    • Refactored .form-file markup to resolve some visual bugs while allowing translation and button text changes via HTML instead of CSS.
    • Dropped native .form-control-file and .form-control-range components entirely.
    • Renamed .custom-file to .form-file (including variables).
    • Added support for :focus and :disabled styles.
  • Renamed .custom-range to .form-range (including variables).
  • Dropped .form-group for margin utilities (we've replaced our docs examples with .mb-3).
  • Dropped .form-row for the more flexible grid gutters.
  • Dropped .form-inline for the more flexible grid.
  • Dropped support for .form-control-plaintext inside .input-groups.
  • Dropped .input-group-append and .input-group-prepend. You can now just add buttons and .input-group-text as direct children of the input groups.
  • Form labels now require the .form-label class. Sass variables are now available to style form labels to your needs. See #30476

Components

  • Unified padding values for alerts, breadcrumbs, cards, dropdowns, list groups, modals, popovers, and tooltips to be based on our $spacer variable. See #30564.

Disabled states

  • Disabled states of the buttons, close button, pagination link & form range now have pointer-events: none added. This simplifies our codebase and makes it easier to override active states in CSS. #29296.

Alerts

  • Todo: Remove auto-darkening of <hr> elements in .alert-* class variants. <hr>s use rgba() for their color, so these should naturally blend anyway.

Badges

Badges were overhauled to better differentiate themselves from buttons and to better utilize utility classes.

  • Todo: Removed and replaced .badge modifier classes with background utility classes (e.g., use .bg-primary instead of .badge-primary)
  • Todo: Removed .badge-pill for the .rounded-pill utility class
  • Todo: Removed badge's hover and focus styles for a.badge and button.badge.

Cards

  • Removed the card columns in favor of a Masonry grid See #28922.
  • Removed card decks in favor of the grid which adds more flexibility over responsive behaviour.

Jumbotron

  • The jumbotron component is removed in favor of utility classes like .bg-light for the background color and .p-* classes to control padding.

Navbars

  • All navbars now require a container within. This drastically simplifies spacing requirements and removes the need for extensive CSS overrides we added for responsive containers in v4.

Pagination

  • Pagination links now have customizable margin-left that are dynamically rounded on all corners when separated from one another.

Popovers

  • Renamed .arrow to .popover-arrow

Tooltips

  • Renamed .arrow to .tooltip-arrow

Accessibility

  • .sr-only-focusable does not require .sr-only anymore. See #28720.

Utilities

  • Renamed .text-monospace to .font-monospace
  • 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.
  • New line-height utilities: .lh-1, .lh-sm, .lh-base and .lh-lg. See [here]({{< docsref "/utilities/text#line-height" >}}).
  • Added .bg-body for quickly setting the <body>'s background to additional elements.
  • Todo: Drop .text-hide as it's an antiquated method for hiding text that shouldn't be used anymore
  • Todo: Split utilities into property-value utility classes and helpers
  • Negative margin utilities are disabled by default. You can re-enable them by setting $enable-negative-margins: true, but keep in mind this can increase the file size quite a lot.

Docs

  • Removed "Wall of browser bugs" page because it has become obsolete

Build tools