Helpers & utilities split (#28445)

scss/helpers/_background.scss

@@ -0,0 +1,5 @@
+@if $enable-gradients {
+  @each $color, $value in $theme-colors {
+    @include bg-gradient-variant(".bg-gradient-#{$color}", $value);
+  }
+}

scss/helpers/_clearfix.scss

@@ -0,0 +1,3 @@
+.clearfix {
+  @include clearfix();
+}

scss/helpers/_embed.scss

@@ -0,0 +1,36 @@
+// Credit: Nicolas Gallagher and SUIT CSS.
+
+.embed-responsive {
+  position: relative;
+  display: block;
+  width: 100%;
+  padding: 0;
+  overflow: hidden;
+
+  &::before {
+    display: block;
+    content: "";
+  }
+
+  .embed-responsive-item,
+  iframe,
+  embed,
+  object,
+  video {
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    border: 0;
+  }
+}
+
+@each $key, $ratio in $embed-responsive-aspect-ratios {
+  .embed-responsive-#{$key} {
+    &::before {
+      padding-top: percentage(map-get($ratio, y) / map-get($ratio, x));
+    }
+  }
+}

scss/helpers/_position.scss

@@ -0,0 +1,27 @@
+// stylelint-disable declaration-no-important
+
+// Shorthand
+
+.fixed-top {
+  position: fixed;
+  top: 0;
+  right: 0;
+  left: 0;
+  z-index: $zindex-fixed;
+}
+
+.fixed-bottom {
+  position: fixed;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  z-index: $zindex-fixed;
+}
+
+.sticky-top {
+  @supports (position: sticky) {
+    position: sticky;
+    top: 0;
+    z-index: $zindex-sticky;
+  }
+}

scss/helpers/_screenreaders.scss

@@ -0,0 +1,8 @@
+//
+// Screenreaders
+//
+
+.sr-only,
+.sr-only-focusable:not(:focus) {
+  @include sr-only();
+}

scss/helpers/_stretched-link.scss

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+//
+// Stretched link
+//
+
+.stretched-link {
+  &::after {
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+    z-index: 1;
+    // Just in case `pointer-events: none` is set on a parent
+    pointer-events: auto;
+    content: "";
+    // IE10 bugfix, see https://stackoverflow.com/questions/16947967/ie10-hover-pseudo-class-doesnt-work-without-background-color
+    background-color: rgba(0, 0, 0, 0);
+  }
+}

scss/helpers/_text.scss

@@ -0,0 +1,7 @@
+//
+// Text
+//
+
+.text-truncate {
+  @include text-truncate;
+}