1 files changed, 2 insertions, 0 deletions
diff --git a/devtools/client/inspector/markup/views/markup-container.js b/devtools/client/inspector/markup/views/markup-container.js
index b54157242..44768b46c 100644
--- a/devtools/client/inspector/markup/views/markup-container.js
+++ b/devtools/client/inspector/markup/views/markup-container.js
@@ -211,10 +211,12 @@ MarkupContainer.prototype = {
     }
 
     if (this.showExpander) {
+      this.elt.classList.add("expandable");
       this.expander.style.visibility = "visible";
       // Update accessibility expanded state.
       this.tagLine.setAttribute("aria-expanded", this.expanded);
     } else {
+      this.elt.classList.remove("expandable");
       this.expander.style.visibility = "hidden";
       // No need for accessible expanded state indicator when expander is not
       // shown.