Helpers & utilities split (#28445)

11 files changed, 334 insertions, 51 deletions

diff --git a/site/content/docs/4.3/utilities/clearfix.md b/site/content/docs/4.3/helpers/clearfix.md
index d89a55a68c..bbae9a3597 100644
--- a/site/content/docs/4.3/utilities/clearfix.md
+++ b/site/content/docs/4.3/helpers/clearfix.md
@@ -2,7 +2,8 @@
 layout: docs
 title: Clearfix
 description: Quickly and easily clear floated content within a container by adding a clearfix utility.
-group: utilities
+group: helpers
+aliases: "/docs/4.3/helpers/"
 ---
 
 Easily clear `float`s by adding `.clearfix` **to the parent element**. Can also be used as a mixin.
diff --git a/site/content/docs/4.3/utilities/embed.md b/site/content/docs/4.3/helpers/embed.md
index e744f27c0f..f6f69c2dc4 100644
--- a/site/content/docs/4.3/utilities/embed.md
+++ b/site/content/docs/4.3/helpers/embed.md
@@ -2,7 +2,7 @@
 layout: docs
 title: Embeds
 description: Create responsive video or slideshow embeds based on the width of the parent by creating an intrinsic ratio that scales on any device.
-group: utilities
+group: helpers
 toc: true
 ---
 
diff --git a/site/content/docs/4.3/helpers/position.md b/site/content/docs/4.3/helpers/position.md
new file mode 100644
index 0000000000..921e47a9f5
--- /dev/null
+++ b/site/content/docs/4.3/helpers/position.md
@@ -0,0 +1,33 @@
+---
+layout: docs
+title: Position
+description: Use these helpers for quickly configuring the position of an element.
+group: helpers
+toc: true
+---
+
+## Fixed top
+
+Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
+
+{{< highlight html >}}
+<div class="fixed-top">...</div>
+{{< /highlight >}}
+
+## Fixed bottom
+
+Position an element at the bottom of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
+
+{{< highlight html >}}
+<div class="fixed-bottom">...</div>
+{{< /highlight >}}
+
+## Sticky top
+
+Position an element at the top of the viewport, from edge to edge, but only after you scroll past it. The `.sticky-top` utility uses CSS's `position: sticky`, which isn't fully supported in all browsers.
+
+**IE11 and IE10 will render `position: sticky` as `position: relative`.** As such, we wrap the styles in a `@supports` query, limiting the stickiness to only browsers that can render it properly.
+
+{{< highlight html >}}
+<div class="sticky-top">...</div>
+{{< /highlight >}}
diff --git a/site/content/docs/4.3/utilities/screen-readers.md b/site/content/docs/4.3/helpers/screen-readers.md
index 7781b11fbf..501b9c311c 100644
--- a/site/content/docs/4.3/utilities/screen-readers.md
+++ b/site/content/docs/4.3/helpers/screen-readers.md
@@ -2,7 +2,7 @@
 layout: docs
 title: Screen readers
 description: Use screen reader utilities to hide elements on all devices except screen readers.
-group: utilities
+group: helpers
 ---
 
 Hide an element to all devices **except screen readers** with `.sr-only`. Use `.sr-only-focusable` to show the element only when it's focused (e.g. by a keyboard-only user). Can also be used as mixins.
diff --git a/site/content/docs/4.3/utilities/stretched-link.md b/site/content/docs/4.3/helpers/stretched-link.md
index ad8a703cad..9b5b3a517c 100644
--- a/site/content/docs/4.3/utilities/stretched-link.md
+++ b/site/content/docs/4.3/helpers/stretched-link.md
@@ -2,7 +2,7 @@
 layout: docs
 title: Stretched link
 description: Make any HTML element or Bootstrap component clickable by "stretching" a nested link via CSS.
-group: utilities
+group: helpers
 ---
 
 Add `.stretched-link` to a link to make its [containing block](https://developer.mozilla.org/en-US/docs/Web/CSS/Containing_block) clickable via a `::after` pseudo element. In most cases, this means that an element with `position: relative;` that contains a link with the `.stretched-link` class is clickable.
diff --git a/site/content/docs/4.3/helpers/text.md b/site/content/docs/4.3/helpers/text.md
new file mode 100644
index 0000000000..bd57099427
--- /dev/null
+++ b/site/content/docs/4.3/helpers/text.md
@@ -0,0 +1,25 @@
+---
+layout: docs
+title: Text
+description: Documentation and examples for common text utilities to control alignment, wrapping, weight, and more.
+group: helpers
+toc: true
+---
+
+## Text truncation
+
+For longer content, you can add a `.text-truncate` class to truncate the text with an ellipsis. **Requires `display: inline-block` or `display: block`.**
+
+{{< example >}}
+<!-- Block level -->
+<div class="row">
+  <div class="col-2 text-truncate">
+    Praeterea iter est quasdam res quas ex communi.
+  </div>
+</div>
+
+<!-- Inline level -->
+<span class="d-inline-block text-truncate" style="max-width: 150px;">
+  Praeterea iter est quasdam res quas ex communi.
+</span>
+{{< /example >}}
diff --git a/site/content/docs/4.3/utilities/api.md b/site/content/docs/4.3/utilities/api.md
new file mode 100644
index 0000000000..7f587b0b6c
--- /dev/null
+++ b/site/content/docs/4.3/utilities/api.md
@@ -0,0 +1,261 @@
+---
+layout: docs
+title: Utility API
+description: The utility API is a Sass based tool to generate utility classes.
+group: utilities
+aliases: "/docs/4.3/utilities/"
+toc: true
+---
+
+The bootstrap utilities are generated with the utility API which can be used to change or extend Bootstraps utility classes. If you don't have any idea what sass maps are, you can consult the [official docs](https://sass-lang.com/documentation/file.SASS_REFERENCE.html#maps) to get started.
+
+The `$utilities` map contains all utilities and is later merged with your custom `$utilities` map if present. The utility map contains a keyed list of utility groups which accept the following options:
+
+- `property`: Name of the property, this can be a string or an array of strings (needed for eg. horizontal paddings or margins).
+- `responsive` _(optional)_: Boolean indicating if responsive classes need to be generated. `false` by default.
+- `class` _(optional)_: Variable to change the class name if you don't want it to be the same as the property.
+- `values`: This can be a list of values or a map if you don't want the class name to be the same as the value. If null is used as map key, it isn't rendered.
+- `print` _(optional)_: Boolean indicating if print classes need to be generated. `false` by default.
+  
+
+## Adding utilities to the utility API
+
+All utility variables are added to the `$utilities` variable. Custom utility groups can added like this:
+
+```scss
+$utilities: (
+  "opacity": (
+    property: opacity,
+    values: (
+      0: 0,
+      25: .25,
+      50: .5,
+      100: 1,
+    )
+  )
+ );
+```
+
+Output:
+
+```css
+.opacity-0 {
+  opacity: 0;
+}
+.opacity-25 {
+  opacity: .25;
+}
+.opacity-75 {
+  opacity: .75;
+}
+.opacity-100 {
+  opacity: 1;
+}
+```
+
+
+## Changing the class prefix
+
+With the `class` option, the class prefix can be changed:
+
+```scss
+$utilities: (
+  "opacity": (
+    property: opacity,
+    class: o,
+    values: (
+      0: 0,
+      25: .25,
+      50: .5,
+      100: 1,
+    )
+  )
+ );
+```
+
+Output:
+
+```css
+.o-0 {
+  opacity: 0;
+}
+.o-25 {
+  opacity: .25;
+}
+.o-75 {
+  opacity: .75;
+}
+.o-100 {
+  opacity: 1;
+}
+```
+
+## Responsive utilities
+
+With the `responsive` option, responsive utility classes can be generated:
+
+```scss
+$utilities: (
+  "opacity": (
+    property: opacity,
+    responsive: true,
+    values: (
+      0: 0,
+      25: .25,
+      50: .5,
+      100: 1,
+    )
+  )
+ );
+```
+
+Output:
+
+```css
+.opacity-0 {
+  opacity: 0;
+}
+.opacity-25 {
+  opacity: .25;
+}
+.opacity-75 {
+  opacity: .75;
+}
+.opacity-100 {
+  opacity: 1;
+}
+@media (min-width: 576px) {
+  .opacity-sm-0 {
+    opacity: 0;
+  }
+  .opacity-sm-25 {
+    opacity: .25;
+  }
+  .opacity-sm-75 {
+    opacity: .75;
+  }
+  .opacity-sm-100 {
+    opacity: 1;
+  }
+}
+@media (min-width: 768px) {
+  .opacity-md-0 {
+    opacity: 0;
+  }
+  .opacity-md-25 {
+    opacity: .25;
+  }
+  .opacity-md-75 {
+    opacity: .75;
+  }
+  .opacity-md-100 {
+    opacity: 1;
+  }
+}
+@media (min-width: 992px) {
+  .opacity-lg-0 {
+    opacity: 0;
+  }
+  .opacity-lg-25 {
+    opacity: .25;
+  }
+  .opacity-lg-75 {
+    opacity: .75;
+  }
+  .opacity-lg-100 {
+    opacity: 1;
+  }
+}
+@media (min-width: 1200px) {
+  .opacity-xl-0 {
+    opacity: 0;
+  }
+  .opacity-xl-25 {
+    opacity: .25;
+  }
+  .opacity-xl-75 {
+    opacity: .75;
+  }
+  .opacity-xl-100 {
+    opacity: 1;
+  }
+}
+```
+
+## Changing utilities
+
+Overriding excising utilities is possible by using the same key. For example if you want more responsive overflow
+utility classes you can do this:
+
+```scss
+$utilities: (
+  "overflow": (
+    responsive: true,
+    property: overflow,
+    values: visible hidden scroll auto,
+  ),
+);
+```
+
+
+## Print utilities
+
+Enabling the `print` option will **also** generate utility classes for print.
+
+```scss
+$utilities: (
+  "opacity": (
+    property: opacity,
+    class: o,
+    print: true,
+    values: (
+      0: 0,
+      25: .25,
+      50: .5,
+      100: 1,
+    )
+  )
+ );
+```
+
+Output:
+
+```css
+.o-0 {
+  opacity: 0;
+}
+.o-25 {
+  opacity: .25;
+}
+.o-75 {
+  opacity: .75;
+}
+.o-100 {
+  opacity: 1;
+}
+
+@media print {
+  .o-print-0 {
+    opacity: 0;
+  }
+  .o-print-25 {
+    opacity: .25;
+  }
+  .o-print-75 {
+    opacity: .75;
+  }
+  .o-print-100 {
+    opacity: 1;
+  }
+}
+```
+
+## Removing utilities
+
+Utilities can also be removed by changing the group key to `null`:
+
+```scss
+$utilities: (
+  "float": null,
+);
+```
diff --git a/site/content/docs/4.3/utilities/borders.md b/site/content/docs/4.3/utilities/borders.md
index 0cb9fc1216..9f082f76a2 100644
--- a/site/content/docs/4.3/utilities/borders.md
+++ b/site/content/docs/4.3/utilities/borders.md
@@ -3,7 +3,6 @@ layout: docs
 title: Borders
 description: Use border utilities to quickly style the border and border-radius of an element. Great for images, buttons, or any other element.
 group: utilities
-aliases: "/docs/4.3/utilities/"
 toc: true
 ---
 
diff --git a/site/content/docs/4.3/utilities/position.md b/site/content/docs/4.3/utilities/position.md
index 1efaf4cf16..4af457da44 100644
--- a/site/content/docs/4.3/utilities/position.md
+++ b/site/content/docs/4.3/utilities/position.md
@@ -17,29 +17,3 @@ Quick positioning classes are available, though they are not responsive.
 <div class="position-fixed">...</div>
 <div class="position-sticky">...</div>
 {{< /highlight >}}
-
-## Fixed top
-
-Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
-
-{{< highlight html >}}
-<div class="fixed-top">...</div>
-{{< /highlight >}}
-
-## Fixed bottom
-
-Position an element at the bottom of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
-
-{{< highlight html >}}
-<div class="fixed-bottom">...</div>
-{{< /highlight >}}
-
-## Sticky top
-
-Position an element at the top of the viewport, from edge to edge, but only after you scroll past it. The `.sticky-top` utility uses CSS's `position: sticky`, which isn't fully supported in all browsers.
-
-**IE11 and IE10 will render `position: sticky` as `position: relative`.** As such, we wrap the styles in a `@supports` query, limiting the stickiness to only browsers that can render it properly.
-
-{{< highlight html >}}
-<div class="sticky-top">...</div>
-{{< /highlight >}}
diff --git a/site/content/docs/4.3/utilities/text.md b/site/content/docs/4.3/utilities/text.md
index 76708e8316..514018e76e 100644
--- a/site/content/docs/4.3/utilities/text.md
+++ b/site/content/docs/4.3/utilities/text.md
@@ -45,22 +45,6 @@ Prevent text from wrapping with a `.text-nowrap` class.
 </div>
 {{< /example >}}
 
-For longer content, you can add a `.text-truncate` class to truncate the text with an ellipsis. **Requires `display: inline-block` or `display: block`.**
-
-{{< example >}}
-<!-- Block level -->
-<div class="row">
-  <div class="col-2 text-truncate">
-    Praeterea iter est quasdam res quas ex communi.
-  </div>
-</div>
-
-<!-- Inline level -->
-<span class="d-inline-block text-truncate" style="max-width: 150px;">
-  Praeterea iter est quasdam res quas ex communi.
-</span>
-{{< /example >}}
-
 ## Word break
 
 Prevent long strings of text from breaking your components' layout by using `.text-break` to set `overflow-wrap: break-word` (and `word-break: break-word` for IE & Edge compatibility).
diff --git a/site/data/nav.yml b/site/data/nav.yml
index 596e3faea3..3851fa206f 100644
--- a/site/data/nav.yml
+++ b/site/data/nav.yml
@@ -53,22 +53,28 @@
     - title: Toasts
     - title: Tooltips
 
+- title: Helpers
+  pages:
+    - title: Clearfix
+    - title: Embed
+    - title: Position
+    - title: Screen readers
+    - title: Stretched link
+    - title: Text
+
 - title: Utilities
   pages:
+    - title: API
     - title: Borders
-    - title: Clearfix
     - title: Colors
     - title: Display
-    - title: Embed
     - title: Flex
     - title: Float
     - title: Overflow
     - title: Position
-    - title: Screen readers
     - title: Shadows
     - title: Sizing
     - title: Spacing
-    - title: Stretched link
     - title: Text
     - title: Vertical align
     - title: Visibility