Adapt to main changes

WIP effort to look at some components and design choices that could make their way into v5.

site/content/docs/5.0/examples/playground/index.html

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+---
+layout: examples
+title: Playground
+extra_css:
+  - "playground.css"
+---
+
+<div class="list-group my-5 mx-auto">
+  <div class="list-group-item d-flex align-items-center">
+    <div class="mb-0">Item with switch</div>
+    <div class="form-check form-switch ml-auto" style="font-size: 1.25rem;">
+      <input class="form-check-input ml-0" type="checkbox" id="playgroundSwitch1" checked>
+      <label class="visually-hidden" for="playgroundSwitch1">Switch label</label>
+    </div>
+  </div>
+  <div class="list-group-item d-flex align-items-center">
+    <div class="mb-0">Another with switch</div>
+    <div class="form-check form-switch ml-auto" style="font-size: 1.25rem;">
+      <input class="form-check-input ml-0" type="checkbox" id="playgroundSwitch2">
+      <label class="visually-hidden" for="playgroundSwitch2">Another switch label</label>
+    </div>
+  </div>
+  <div class="list-group-item d-flex align-items-center">
+    <div class="mb-0">Choose an option</div>
+    <div class="d-flex align-items-center ml-auto">
+      <span class="text-muted">Selected</span>
+      <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" class="bi bi-chevron-right" viewBox="0 0 20 20">
+        <path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 16l6-6-6-6"/>
+      </svg>
+    </div>
+  </div>
+</div>
+
+<div class="button-group my-5 mx-auto">
+  <button type="button" class="button-group-item active">Selected</button>
+  <button type="button" class="button-group-item">Second</button>
+  <button type="button" class="button-group-item">Third</button>
+</div>
+
+<div class="p-5 mx-auto">
+  <nav class="btn-group d-flex justify-content-center mb-n3 rounded">
+    <button class="btn btn-outline-primary active" type="button">Selected</button>
+    <button class="btn btn-outline-primary" type="button">Second</button>
+    <button class="btn btn-outline-primary" type="button">Third</button>
+  </nav>
+  <div class="border rounded p-5 bg-light">
+    Example of a well with macOS style segmented nav above.
+  </div>
+</div>
+
+<div id="carouselExampleIndicators" class="carousel slide mx-auto" data-bs-ride="carousel">
+  <ol class="carousel-indicators d-flex justify-content-end mx-0 mb-1">
+    <li data-bs-target="#carouselExampleIndicators" data-bs-slide-to="0" class="active"></li>
+    <li data-bs-target="#carouselExampleIndicators" data-bs-slide-to="1"></li>
+    <li data-bs-target="#carouselExampleIndicators" data-bs-slide-to="2"></li>
+  </ol>
+  <div class="carousel-inner">
+    <div class="carousel-item active">
+      {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100 rounded" color="#555" background="#777" text="First slide" >}}
+    </div>
+    <div class="carousel-item">
+      {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100 rounded" color="#444" background="#666" text="Second slide" >}}
+    </div>
+    <div class="carousel-item">
+      {{< placeholder width="800" height="400" class="bd-placeholder-img-lg d-block w-100 rounded" color="#333" background="#555" text="Third slide" >}}
+    </div>
+  </div>
+</div>
+
+<div class="position-relative my-5 mx-auto bg-dark" style="width: 375px; height: 812px; border-radius: 1.5rem;">
+  <div class="text-center p-3">
+    <button type="button" class="btn btn-lg btn-primary" data-bs-toggle="modal" data-bs-target="#modal">Show</button>
+  </div>
+
+  <div class="modal modal-sheet" tabindex="-1" role="dialog" id="modal">
+    <div class="modal-dialog" role="document">
+      <div class="modal-content">
+        <div class="modal-header border-bottom-0">
+          <h5 class="modal-title">Modal title</h5>
+          <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+        </div>
+        <div class="modal-body py-0">
+          <p>This is a modal sheet, a variation of the modal that docs itself to the bottom of the viewport like the newer share sheets in iOS.</p>
+        </div>
+        <div class="modal-footer flex-column border-top-0">
+          <button type="button" class="btn btn-lg btn-primary w-100 mx-0 mb-2">Save changes</button>
+          <button type="button" class="btn btn-lg btn-link w-100 mx-0" data-bs-dismiss="modal">Close</button>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>

site/content/docs/5.0/examples/playground/playground.css

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+/* stylelint-disable declaration-no-important */
+
+body > div {
+  max-width: 40rem;
+}
+
+.btn-group {
+  /* margin-bottom: -50%; */
+}
+
+.btn-group > .btn {
+  flex: 0;
+}
+
+.btn-outline-primary:not(:hover) {
+  background-color: #fff;
+}
+
+
+.carousel-indicators {
+  position: static;
+}
+
+.carousel-indicators li {
+  width: .5rem;
+  height: .5rem;
+  background-color: currentColor;
+  border-radius: 50%;
+}
+
+.carousel-indicators li:last-child {
+  margin-right: 0;
+}
+
+
+.modal-sheet {
+  position: absolute;
+  /* display: block; */
+  overflow: hidden;
+}
+
+.modal-sheet .modal-dialog {
+  position: absolute;
+  right: .5rem;
+  bottom: -100%;
+  left: .5rem;
+  margin-bottom: .5rem;
+  box-shadow: 0 6px 24px rgba(0, 0, 0, .25);
+  transition: bottom .75s ease-in-out;
+}
+
+.modal-sheet.show .modal-dialog {
+  bottom: 0;
+}
+
+
+.modal-sheet .modal-content {
+  border-radius: 1rem;
+}
+
+.modal-sheet .modal-footer {
+  padding-bottom: 2rem;
+}
+
+/* Hack for now */
+.modal-backdrop { display: none !important; }
+
+
+.button-group {
+  display: flex;
+  padding: .1em;
+  background-color: rgba(0, 0, 0, .1);
+  border: 1px solid rgba(0, 0, 0, .1);
+  border-radius: 4rem;
+}
+.button-group-item {
+  flex: 1 1 0;
+  padding: .375rem .75rem;
+  background: none;
+  border: 0;
+}
+.button-group-item.active {
+  background-color: #fff;
+  border-radius: 3.9rem;
+  box-shadow: 0 .1em .2em rgba(0, 0, 0, .1);
+}