Grabbed dndbeyond's source code

``` ~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js ```
2025-05-28 11:50:03 -07:00
commit 8df9031d27
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+// Source from https://github.com/alitaheri/normalize-scroll-left
+let cachedType;
+
+/**
+ * Based on the jquery plugin https://github.com/othree/jquery.rtl-scroll-type
+ *
+ * Types of scrollLeft, assuming scrollWidth=100 and direction is rtl.
+ *
+ * Type             | <- Most Left | Most Right -> | Initial
+ * ---------------- | ------------ | ------------- | -------
+ * default          | 0            | 100           | 100
+ * negative (spec*) | -100         | 0             | 0
+ * reverse          | 100          | 0             | 0
+ *
+ * Edge 85: default
+ * Safari 14: negative
+ * Chrome 85: negative
+ * Firefox 81: negative
+ * IE11: reverse
+ *
+ * spec* https://drafts.csswg.org/cssom-view/#dom-window-scroll
+ */
+export function detectScrollType() {
+  if (cachedType) {
+    return cachedType;
+  }
+  const dummy = document.createElement('div');
+  const container = document.createElement('div');
+  container.style.width = '10px';
+  container.style.height = '1px';
+  dummy.appendChild(container);
+  dummy.dir = 'rtl';
+  dummy.style.fontSize = '14px';
+  dummy.style.width = '4px';
+  dummy.style.height = '1px';
+  dummy.style.position = 'absolute';
+  dummy.style.top = '-1000px';
+  dummy.style.overflow = 'scroll';
+  document.body.appendChild(dummy);
+  cachedType = 'reverse';
+  if (dummy.scrollLeft > 0) {
+    cachedType = 'default';
+  } else {
+    dummy.scrollLeft = 1;
+    if (dummy.scrollLeft === 0) {
+      cachedType = 'negative';
+    }
+  }
+  document.body.removeChild(dummy);
+  return cachedType;
+}
+
+// Based on https://stackoverflow.com/a/24394376
+export function getNormalizedScrollLeft(element, direction) {
+  const scrollLeft = element.scrollLeft;
+
+  // Perform the calculations only when direction is rtl to avoid messing up the ltr behavior
+  if (direction !== 'rtl') {
+    return scrollLeft;
+  }
+  const type = detectScrollType();
+  switch (type) {
+    case 'negative':
+      return element.scrollWidth - element.clientWidth + scrollLeft;
+    case 'reverse':
+      return element.scrollWidth - element.clientWidth - scrollLeft;
+    default:
+      return scrollLeft;
+  }
+}