7 files changed, 68 insertions, 7 deletions
diff --git a/scss/helpers/_color-bg.scss b/scss/helpers/_color-bg.scss
new file mode 100644
index 000000000..1a3a4cffd
--- /dev/null
+++ b/scss/helpers/_color-bg.scss
@@ -0,0 +1,7 @@
+// All-caps `RGBA()` function used because of this Sass bug: https://github.com/sass/node-sass/issues/2251
+@each $color, $value in $theme-colors {
+  .text-bg-#{$color} {
+    color: color-contrast($value) if($enable-important-utilities, !important, null);
+    background-color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}bg-opacity, 1)) if($enable-important-utilities, !important, null);
+  }
+}
diff --git a/scss/helpers/_colored-links.scss b/scss/helpers/_colored-links.scss
index 8c167dedf..5f8685780 100644
--- a/scss/helpers/_colored-links.scss
+++ b/scss/helpers/_colored-links.scss
@@ -1,12 +1,30 @@
+// All-caps `RGBA()` function used because of this Sass bug: https://github.com/sass/node-sass/issues/2251
 @each $color, $value in $theme-colors {
   .link-#{$color} {
-    color: $value;
+    color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}link-opacity, 1)) if($enable-important-utilities, !important, null);
+    text-decoration-color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}link-underline-opacity, 1)) if($enable-important-utilities, !important, null);
 
     @if $link-shade-percentage != 0 {
       &:hover,
       &:focus {
-        color: if(color-contrast($value) == $color-contrast-light, shade-color($value, $link-shade-percentage), tint-color($value, $link-shade-percentage));
+        $hover-color: if(color-contrast($value) == $color-contrast-light, shade-color($value, $link-shade-percentage), tint-color($value, $link-shade-percentage));
+        color: RGBA(#{to-rgb($hover-color)}, var(--#{$prefix}link-opacity, 1)) if($enable-important-utilities, !important, null);
+        text-decoration-color: RGBA(to-rgb($hover-color), var(--#{$prefix}link-underline-opacity, 1)) if($enable-important-utilities, !important, null);
       }
     }
   }
 }
+
+// One-off special link helper as a bridge until v6
+.link-body-emphasis {
+  color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-opacity, 1)) if($enable-important-utilities, !important, null);
+  text-decoration-color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-underline-opacity, 1)) if($enable-important-utilities, !important, null);
+
+  @if $link-shade-percentage != 0 {
+    &:hover,
+    &:focus {
+      color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-opacity, .75)) if($enable-important-utilities, !important, null);
+      text-decoration-color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-underline-opacity, .75)) if($enable-important-utilities, !important, null);
+    }
+  }
+}
diff --git a/scss/helpers/_focus-ring.scss b/scss/helpers/_focus-ring.scss
new file mode 100644
index 000000000..26508a8d6
--- /dev/null
+++ b/scss/helpers/_focus-ring.scss
@@ -0,0 +1,5 @@
+.focus-ring:focus {
+  outline: 0;
+  // By default, there is no `--bs-focus-ring-x`, `--bs-focus-ring-y`, or `--bs-focus-ring-blur`, but we provide CSS variables with fallbacks to initial `0` values
+  box-shadow: var(--#{$prefix}focus-ring-x, 0) var(--#{$prefix}focus-ring-y, 0) var(--#{$prefix}focus-ring-blur, 0) var(--#{$prefix}focus-ring-width) var(--#{$prefix}focus-ring-color);
+}
diff --git a/scss/helpers/_icon-link.scss b/scss/helpers/_icon-link.scss
new file mode 100644
index 000000000..3f8bcb335
--- /dev/null
+++ b/scss/helpers/_icon-link.scss
@@ -0,0 +1,25 @@
+.icon-link {
+  display: inline-flex;
+  gap: $icon-link-gap;
+  align-items: center;
+  text-decoration-color: rgba(var(--#{$prefix}link-color-rgb), var(--#{$prefix}link-opacity, .5));
+  text-underline-offset: $icon-link-underline-offset;
+  backface-visibility: hidden;
+
+  > .bi {
+    flex-shrink: 0;
+    width: $icon-link-icon-size;
+    height: $icon-link-icon-size;
+    fill: currentcolor;
+    @include transition($icon-link-icon-transition);
+  }
+}
+
+.icon-link-hover {
+  &:hover,
+  &:focus-visible {
+    > .bi {
+      transform: var(--#{$prefix}icon-link-transform, $icon-link-icon-transform);
+    }
+  }
+}
diff --git a/scss/helpers/_position.scss b/scss/helpers/_position.scss
index 31851eb72..59103d943 100644
--- a/scss/helpers/_position.scss
+++ b/scss/helpers/_position.scss
@@ -16,7 +16,7 @@
   z-index: $zindex-fixed;
 }
 
-// Responsive sticky top
+// Responsive sticky top and bottom
 @each $breakpoint in map-keys($grid-breakpoints) {
   @include media-breakpoint-up($breakpoint) {
     $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
@@ -26,5 +26,11 @@
       top: 0;
       z-index: $zindex-sticky;
     }
+
+    .sticky#{$infix}-bottom {
+      position: sticky;
+      bottom: 0;
+      z-index: $zindex-sticky;
+    }
   }
 }
diff --git a/scss/helpers/_ratio.scss b/scss/helpers/_ratio.scss
index 2390ee339..b6a7654c5 100644
--- a/scss/helpers/_ratio.scss
+++ b/scss/helpers/_ratio.scss
@@ -6,7 +6,7 @@
 
   &::before {
     display: block;
-    padding-top: var(--#{$variable-prefix}aspect-ratio);
+    padding-top: var(--#{$prefix}aspect-ratio);
     content: "";
   }
 
@@ -21,6 +21,6 @@
 
 @each $key, $ratio in $aspect-ratios {
   .ratio-#{$key} {
-    --#{$variable-prefix}aspect-ratio: #{$ratio};
+    --#{$prefix}aspect-ratio: #{$ratio};
   }
 }
diff --git a/scss/helpers/_vr.scss b/scss/helpers/_vr.scss
index 37f864777..b6f9d42cb 100644
--- a/scss/helpers/_vr.scss
+++ b/scss/helpers/_vr.scss
@@ -1,8 +1,8 @@
 .vr {
   display: inline-block;
   align-self: stretch;
-  width: 1px;
+  width: $vr-border-width;
   min-height: 1em;
-  background-color: currentColor;
+  background-color: currentcolor;
   opacity: $hr-opacity;
 }