In the following spots a "MouseUp" eventName is being used, which does look inconsistent considering that the "Mouse Down"/"Mouse Enter"/"Mouse Exit" eventNames all have a space in them.
Is this inconsistency actually expected, or is it a simple typo? If the former, then a comment explaining *why* would be appropriate; otherwise we should just fix this :-)

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L806

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L945

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1034

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1168

/cc @calixteman 
link.href = this.linkService.getAnchorUrl("");
    const map = new Map([
      ["Action", "onclick"],
      ["MouseUp", "onmouseup"],
      ["MouseDown", "onmousedown"],
    ]);
    for (const name of Object.keys(data.actions)) {
      const jsName = map.get(name);
      if (!jsName) {
        continue;
      }
      link[jsName] = () => {
        this.linkService.eventBus?.dispatch("dispatcheventinsandbox", {
          source: this,
          detail: {
            id: data.id,
            name,
          },
        });
        return false;
      };
    }
    link.className = "internalLink";
  }
}
class TextAnnotationElement extends AnnotationElement {