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HTML 

              
                # New Bootstrap v5 forms

A quick look at some of the major changes coming to form controls in Bootstrap 5.

## Checks

<hr class="mt-2 mb-3">

Taking a fresh pass at custom checkboxes and radios without psuedo-elements, thus replacing our previous native form control styles. By resetting the `appearance`, we should be able to style the inputs across Edge, Chrome, Firefox, and Safari.

**Differences from v4:**

- Custom form controls are the new native.
- No more custom HTML is required for the new form controls. They're 100% styled from the `<input>` itself with `appearance: none;`.
- Form controls are 25% larger, moving from `1rem` (`16px`) to `1.25em` (`20px`).
- Form controls are now built with `em`s instead of `rem`s for easy sizing.
- Instead of `position: absolute;`, `<input>`s are aligned with `float` and `margin-top` to help align and scale with sizing options.
- No more `.custom-checkbox-inline` modifier class—instead, use utilities for way more flexibility in your layouts.

These new checks and their text are aligned the same way as v4—with `padding-left` on the outer container. This is so any and all siblings to the `<input>` (like the `<label>`, help text, or validation feedback) is easily aligned.

Flexbox styles were originally attempted, but they're unnecessary and were abandoned early in favor of a `float`ed `<input>`.

### Default styles

<div class="flex-check">
  <input class="flex-check-input" type="checkbox" id="check1" checked>
  <label class="flex-check-label" for="check1">This is the new custom checkbox</label>
  <small class="text-muted d-block">Some additional help text could appear right here.</small>
</div>

<div class="flex-check">
  <input class="flex-check-input" type="checkbox" id="checkindeterminate">
  <label class="flex-check-label" for="checkindeterminate">This is an indeterminate custom checkbox</label>
  <small class="text-muted d-block">Indeterminate checkboxes must be toggled via JavaScript—there's no HTML attribute for this.</small>
</div>

<div class="flex-check">
  <input class="flex-check-input" type="checkbox" id="longcheck">
  <label class="flex-check-label" for="longcheck">This is the new custom checkbox with text that wraps to multiple lines because of a super long label that I keep adding text to so that it does that whole wrapping thing easily enough.</label>
</div>

<div class="flex-check">
  <input class="flex-check-input" type="checkbox" id="disabledcheck" disabled>
  <label class="flex-check-label" for="disabledcheck">This is the new disabled custom checkbox</label>
</div>

<br>

<div class="flex-check">
  <input class="flex-check-input" type="radio" id="radio1" name="radios" checked>
  <label class="flex-check-label" for="radio1">Custom radio that's checked</label>
</div>

<div class="flex-check">
  <input class="flex-check-input" type="radio" id="radio2" name="radios">
  <label class="flex-check-label" for="radio2">Custom radio that isn't</label>
</div>

<div class="flex-check">
  <input class="flex-check-input" type="radio" id="radio3" name="radios" disabled>
  <label class="flex-check-label" for="radio3">Custom radio that's disabled</label>
</div>

<br>

<div class="flex-check flex-switch">
  <input class="flex-check-input" type="checkbox" id="switch1">
  <label class="flex-check-label" for="switch1">Custom switch checkbox input</label>
</div>

<div class="flex-check flex-switch">
  <input class="flex-check-input" type="checkbox" id="switch2" disabled>
  <label class="flex-check-label" for="switch2">Disabled custom switch checkbox input</label>
</div>

<br>

<div class="flex-check flex-switch">
  <input class="flex-check-input" type="radio" id="switchradio1" name="switchradio">
  <label class="flex-check-label" for="switchradio1">Custom switch radio that's checked</label>
</div>

<div class="flex-check flex-switch">
  <input class="flex-check-input" type="radio" id="switchradio2" name="switchradio">
  <label class="flex-check-label" for="switchradio2">Second custom switch radio</label>
</div>

### Without label

And without labels inside the wrapper:

<div class="form-group row">
  <label class="col-md-3" for="check-no-label">External label</label>
  <div class="col-md-9">
    <div class="flex-check">
      <input class="flex-check-input" type="checkbox" id="check-no-label" checked>
    </div>
  </div>
</div>

<div class="form-group row">
  <label class="col-md-3" for="switch-no-label">External label</label>
  <div class="col-md-9">
    <div class="flex-check flex-switch">
      <input class="flex-check-input" type="checkbox" id="switch-no-label" checked>
    </div>
  </div>
</div>

### Inline

Make any checkbox, radio, or switch appear "inline" with utility classes. We recommend `.d-inline-block` and `margin` utilities (e.g., `.mr-3`) as needed.

<div class="flex-check d-inline-block mr-3">
  <input class="flex-check-input" type="checkbox" id="checkInline1" checked>
  <label class="flex-check-label" for="checkInline1">Inline checkbox</label>
</div>
<div class="flex-check d-inline-block mr-3">
  <input class="flex-check-input" type="checkbox" id="checkInline2">
  <label class="flex-check-label" for="checkInline2">Another one</label>
</div>
<div class="flex-check flex-switch d-inline-block">
  <input class="flex-check-input" type="checkbox" id="switchInline1">
  <label class="flex-check-label" for="switchInline1">Inline switch</label>
</div>

### Sizing

Built with `em` units, custom checks, radios, and switches will scale to their own `font-size`, or their containing element's (explicit or inherited) `font-size`. Here we're using a modifier class to set `font-size: 1.5rem` on the container.

<div class="flex-check flex-check-lg">
  <input class="flex-check-input" type="checkbox" id="sizingcheck1">
  <label class="flex-check-label" for="sizingcheck1">Resized custom check</label>
</div>

<div class="flex-check flex-check-lg">
  <input class="flex-check-input" type="radio" id="sizingradio1" name="sizingradios">
  <label class="flex-check-label" for="sizingradio1">Resized custom radio</label>
</div>

<div class="flex-check flex-switch flex-check-lg mb-3">
  <input class="flex-check-input" type="checkbox" id="sizingswitch1">
  <label class="flex-check-label" for="sizingswitch1">Resized custom switch checkbox</label>
</div>

Note that you could scope the sizing to the `<input>` itself, but you'll need additional styles to change the indentation of the `<label>`'s text. Alternatively, you could set a `font-size` on the wrapper and then override the `<label>`'s `font-size`.

<div class="flex-check flex-switch" style="font-size: 1.5rem;">
  <input class="flex-check-input" type="checkbox" id="sizingSwitch2">
  <label class="flex-check-label" for="sizingSwitch2" style="font-size: 1rem;">Large switch, normal label text</label>
</div>

## Selects

<hr class="mt-2 mb-3">

Without the `.form-select`, the previous `.custom-select` is going to become the default styling, providing a unified look across all platforms.

### Default styles

Below are the default and disabled selects. Disabled styles are the same as our checks—no `pointer-events` and an `opacity` change.

<select class="flex-select mb-3">
  <option selected>Open this select menu</option>
  <option value="1">One</option>
  <option value="2">Two</option>
  <option value="3">Three</option>
</select>

<select class="flex-select" disabled>
  <option selected>Disabled select menu</option>
  <option value="1">One</option>
  <option value="2">Two</option>
  <option value="3">Three</option>
</select>

### Inline

Similar to the new checks, make selects inline with a modifier class: `.w-auto`. Selects are `inline-block` to begin with, so no need to change their `display`.

<div class="mb-3">
  <select class="flex-select w-auto mr-3">
    <option selected>Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
  <div class="flex-check d-inline-block">
    <input class="flex-check-input" type="checkbox" id="selectInlineCheck">
    <label class="flex-check-label" for="selectInlineCheck">Inline checkbox</label>
  </div>
</div>

Vertical alignment may become an issue, so consider wrapping your inline form controls in some flex and margin utilities. The example below features a wrapper with `.d-flex` and `.align-items-center`, plus `.mb-0` on the inline checkbox.

<div class="d-flex align-items-center">
  <select class="flex-select w-auto mr-3">
    <option selected>Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
  <div class="flex-check d-inline-block mb-0">
    <input class="flex-check-input" type="checkbox" id="selectInlineCheck2">
    <label class="flex-check-label" for="selectInlineCheck2">Inline checkbox</label>
  </div>
</div>

### Sizing

Sizing should become similar to the new checks and switches as they're now built with `em`s. Below is the same select as above, but with an increased `font-size` of `1.5rem`.

<select class="flex-select mb-3" style="font-size: 1.5rem;">
  <option selected>Open this select menu</option>
  <option value="1">One</option>
  <option value="2">Two</option>
  <option value="3">Three</option>
</select>

And making it smaller with `font-size: .875rem;`.

<select class="flex-select mb-3" style="font-size: .875rem;">
  <option selected>Open this select menu</option>
  <option value="1">One</option>
  <option value="2">Two</option>
  <option value="3">Three</option>
</select>

### Multiple and size attributes

Adding `multple` or `size` should render the select as expected, though with (expected) limited styling of the `<option>`s.

<select class="flex-select mb-3" multiple>
  <option value="1">One</option>
  <option value="2">Two</option>
  <option value="3">Three</option>
  <option value="4">Four</option>
  <option value="5">Five</option>
</select>

<select class="flex-select mb-3" size="3">
  <option value="1">One</option>
  <option value="2">Two</option>
  <option value="3">Three</option>
  <option value="4">Four</option>
  <option value="5">Five</option>
</select>

## File

<hr class="mt-2 mb-3">

<div class="flex-file">
  <input type="file" class="flex-file-input" id="customFile">
  <label class="flex-file-label" for="customFile" data-browse="Browse">Choose file</label>
</div>
!

CSS 

              
                :root {
  --background: #fff;
  --foreground: #333;

  --accent-color: #fff;
  --accent-bg: var(--blue);
  // --accent-bg: var(--purple);
  
  --check-width: 1.25em;
  --check-bg-size: calc(var(--check-width) - .5em);
  --check-gutter: calc(var(--check-width) + .5em);

  --switch-width: 2em;
  --switch-gutter: calc(var(--switch-width) + .5em);
  
  --file-height: calc((.375em * 2) + 1.5em);
  
  --focus-ring: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

body {
  max-width: 48rem;
  padding: 2rem;
  margin: 0 auto 6rem;
}

h2 { margin-top: 2rem; }
h3 { margin-top: 1.5rem; }
li + li { margin-top: .25rem; }

//
// Checks and radios
//

.flex-check {
  padding-left: var(--check-gutter);
  margin-bottom: .5rem;
  min-height: 1.5rem; // font-size * line-height
}

.flex-check-input {
  -webkit-appearance: none;
  appearance: none;
  float: left;
  width: var(--check-width);
  height: var(--check-width);
  margin-top: calc((1.5em - var(--check-width)) / 2); // line-height minus check height
  margin-left: calc(var(--check-gutter) * -1);
  background-color: #fff;
  border: 1px solid rgba(0,0,0,.25);
  
  &[type="checkbox"] {
    border-radius: .25em;    
  }

  &[type="radio"] {
    border-radius: 50%;    
  }
  
  &:active {
    filter: brightness(90%);
  }
  
  &:focus {
    outline: 0;
    border-color: var(--accent-bg);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
  }

  &:checked {
    border-color: var(--accent-bg);
    background-color: var(--accent-bg);
    background-repeat: no-repeat;
    background-position: center center;
    background-size: var(--check-bg-size);
    
    &[type="checkbox"] {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%23fff' d='M6.564.75l-3.59 3.612-1.538-1.55L0 4.26 2.974 7.25 8 2.193z'/%3e%3c/svg%3e");
    }
    
    &[type="radio"] {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23fff'/%3e%3c/svg%3e");
    }
  }
  
  &[type="checkbox"]:indeterminate {
    border-color: var(--accent-bg);
    background-color: var(--accent-bg);
    background-repeat: no-repeat;
    background-position: center center;
    background-size: var(--check-bg-size);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 4'%3e%3cpath stroke='%23fff' d='M0 2h4'/%3e%3c/svg%3e");
  }

  &:disabled {
    opacity: .5;
    pointer-events: none;
    filter: none;
    
    ~ .flex-check-label {
      opacity: .5;
    }
  }
}

.flex-check-label {
  margin-bottom: 0;
}


//
// Switch
//

.flex-switch {
  padding-left: var(--switch-gutter);
  
  .flex-check-input {
    width: var(--switch-width);
    margin-left: calc(var(--switch-gutter) * -1);
    background-repeat: no-repeat;
    background-position: left center;
    background-size: calc(var(--check-width) - 2px); // Get a 1px separation
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='rgba(0,0,0,.25)'/%3e%3c/svg%3e");
    border-radius: 2em;
    transition: .2s ease-in-out;
    transition-property: background-position, background-color;
    
    &:focus {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='hsla(211, 100%, 75%, 1)'/%3e%3c/svg%3e");
    }
    
    &:checked {
      background-position: right center;
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='rgba(255,255,255,1)'/%3e%3c/svg%3e");
    }
  }
}

.flex-check-lg {
  font-size: 1.5rem;
}


//
// New selects
//

.flex-select {
  display: inline-block;
  width: 100%;
  padding: .375em calc(.75em * 2.5) .375em .75em;
  vertical-align: middle;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3e%3cpath fill='rgba(0,0,0,.5)' d='M2 0L0 2h4zm0 5L0 3h4z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right .75em center;
  background-size: .5em auto;
  background-color: #fff;
  border: 1px solid rgba(0,0,0,.25);
  border-radius: .25em;
  -webkit-appearance: none;
  appearance: none;

  &:focus {
    outline: 0;
    border-color: var(--accent-bg);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);

    &::-ms-value {
      // For visual consistency with other platforms/browsers,
      // suppress the default white text on blue background highlight given to
      // the selected option text when the (still closed) <select> receives focus
      // in IE and (under certain conditions) Edge.
      // See https://github.com/twbs/bootstrap/issues/19398.
      color: inherit; // does this need to be a hex value?
      background-color: #fff;
    }
  }

  &[multiple],
  &[size]:not([size="1"]) {
    height: auto;
    // padding-right: $custom-select-padding-x;
    background-image: none;
  }

  &:disabled {
    pointer-events: none;
    opacity: .5;
    // color: $custom-select-disabled-color;
    // background-color: $custom-select-disabled-bg;
  }

  // Hides the default caret in IE11
  &::-ms-expand {
    opacity: 0;
  }
}


//
// File
//

.flex-file {
  position: relative;
  display: inline-block;
  width: 100%;
  // height: var(--file-height);
}

.flex-file-input {
  position: relative;
  z-index: 2;
  width: 100%;
  // height: var(--file-height);
  margin: 0;
  opacity: 0;

  &:focus ~ .flex-file-label {
    border-color: var(--accent-bg);
    box-shadow: var(--focus-ring);
  }

  &:disabled ~ .flex-file-label {
    // background-color: $custom-file-disabled-bg;
  }

  // @each $lang, $value in $custom-file-text {
  //   &:lang(#{$lang}) ~ .custom-file-label::after {
  //     content: $value;
  //   }
  // }

  ~ .flex-file-label[data-browse]::after {
    content: attr(data-browse);
  }
}

.flex-file-label {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1;
  // height: var(--file-height);
  padding: .375em .75em;
  // padding: $custom-file-padding-y $custom-file-padding-x;
  background-color: #fff;
  border: 1px solid rgba(0,0,0,.25);
  border-radius: .25em;
  // @include box-shadow($custom-file-box-shadow);

  &::after {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 3;
    display: block;
    // height: $custom-file-height-inner;
    padding: .375em .75em;
    // padding: $custom-file-padding-y $custom-file-padding-x;
    // line-height: $custom-file-line-height;
    // color: $custom-file-button-color;
    // content: "Browse";
    background-color: rgba(0,0,0,.05);
    // @include gradient-bg($custom-file-button-bg);
    border-left: inherit;
    // @include border-radius(0 $custom-file-border-radius $custom-file-border-radius 0);
  }
}
!

JS 

              
                var checkbox = document.getElementById("checkindeterminate");
checkbox.indeterminate = true;
!
999px

Console