6 files changed, 24 insertions, 9 deletions
diff --git a/devtools/client/framework/test/browser.ini b/devtools/client/framework/test/browser.ini
index f34cd66f0..2404490ce 100644
--- a/devtools/client/framework/test/browser.ini
+++ b/devtools/client/framework/test/browser.ini
@@ -91,5 +91,3 @@ skip-if = os == "mac" && os_version == "10.8" || os == "win" && os_version == "5
 [browser_toolbox_window_title_frame_select.js]
 [browser_toolbox_zoom.js]
 [browser_two_tabs.js]
-# We want this test to run for mochitest-dt as well, so we include it here:
-[../../../../browser/base/content/test/general/browser_parsable_css.js]
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.
diff --git a/devtools/client/themes/markup.css b/devtools/client/themes/markup.css
index 4b4cfd031..0569b7ce7 100644
--- a/devtools/client/themes/markup.css
+++ b/devtools/client/themes/markup.css
@@ -197,6 +197,22 @@ ul.children + .tag-line::before {
   display: inline;
 }
 
+.expandable.collapsed .close::before {
+  /* Display an ellipsis character in collapsed nodes that can be expanded. */
+  content: "\2026";
+  display: inline-block;
+  width: 12px;
+  height: 8px;
+  margin: 0 2px;
+  line-height: 3px;
+  color: var(--theme-body-color-inactive);
+  border-radius: 3px;
+  border-style: solid;
+  border-width: 1px;
+  text-align: center;
+  vertical-align: middle;
+}
+
 /* Hide HTML void elements (img, hr, br, …) closing tag when the element is not
  * expanded (it can be if it has pseudo-elements attached) */
 .child.collapsed > .tag-line .void-element .close {
@@ -318,7 +334,8 @@ ul.children + .tag-line::before {
 .theme-selected ~ .editor .theme-fg-color4,
 .theme-selected ~ .editor .theme-fg-color5,
 .theme-selected ~ .editor .theme-fg-color6,
-.theme-selected ~ .editor .theme-fg-color7 {
+.theme-selected ~ .editor .theme-fg-color7,
+.theme-selected ~ .editor .close::before {
   color: var(--theme-selection-color);
 }
 
diff --git a/devtools/shared/gcli/source/lib/gcli/commands/commands.js b/devtools/shared/gcli/source/lib/gcli/commands/commands.js
index 67793b2dc..0af4be620 100644
--- a/devtools/shared/gcli/source/lib/gcli/commands/commands.js
+++ b/devtools/shared/gcli/source/lib/gcli/commands/commands.js
@@ -335,10 +335,10 @@ Parameter.prototype.toJson = function() {
   };
 
   // Values do not need to be serializable, so we don't try. For the client
-  // side (which doesn't do any executing) we don't actually care what the
-  // default value is, just that it exists
+  // side (which doesn't do any executing) we only care whether default value is
+  // undefined, null, or something else.
   if (this.paramSpec.defaultValue !== undefined) {
-    json.defaultValue = {};
+    json.defaultValue = (this.paramSpec.defaultValue === null) ? null : {};
   }
   if (this.paramSpec.description != null) {
     json.description = this.paramSpec.description;
diff --git a/devtools/shared/gcli/source/lib/gcli/commands/help.js b/devtools/shared/gcli/source/lib/gcli/commands/help.js
index 317f80240..7d1cc9087 100644
--- a/devtools/shared/gcli/source/lib/gcli/commands/help.js
+++ b/devtools/shared/gcli/source/lib/gcli/commands/help.js
@@ -69,7 +69,7 @@ function getHelpManData(commandData, context) {
       }
       else {
         // We need defaultText to work the text version of defaultValue
-        input = l10n.lookupFormat('helpManOptional');
+        input = l10n.lookup('helpManOptional');
         /*
         var val = param.type.stringify(param.defaultValue);
         input = Promise.resolve(val).then(function(defaultValue) {
diff --git a/devtools/shared/webconsole/test/chrome.ini b/devtools/shared/webconsole/test/chrome.ini
index ae867b821..fde5a79fd 100644
--- a/devtools/shared/webconsole/test/chrome.ini
+++ b/devtools/shared/webconsole/test/chrome.ini
@@ -8,8 +8,6 @@ support-files =
   network_requests_iframe.html
   sandboxed_iframe.html
   console-test-worker.js
-  !/browser/base/content/test/general/browser_star_hsts.sjs
-  !/browser/base/content/test/general/pinning_headers.sjs
 
 [test_basics.html]
 [test_bug819670_getter_throws.html]