Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/tools/js/CharacterSheet/components/SubsectionMobile/SubsectionMobile.tsx

@@ -0,0 +1,24 @@
+import React from "react";
+
+import { FormatUtils } from "@dndbeyond/character-rules-engine/es";
+
+interface Props {
+  name?: string;
+  className: string;
+}
+export default class SubsectionMobile extends React.PureComponent<Props> {
+  static defaultProps = {
+    className: "",
+  };
+
+  render() {
+    const { name, children, className } = this.props;
+
+    let classNames: Array<string> = [className, "ct-subsection-mobile"];
+    if (name) {
+      classNames.push(`ct-subsection-mobile--${FormatUtils.slugify(name)}`);
+    }
+
+    return <div className={classNames.join(" ")}>{children}</div>;
+  }
+}

ddb_main/tools/js/CharacterSheet/components/SubsectionMobile/index.ts

@@ -0,0 +1,4 @@
+import SubsectionMobile from "./SubsectionMobile";
+
+export default SubsectionMobile;
+export { SubsectionMobile };