LibWeb: Parse the -webkit-progress-bar/value pseudo elements

These will be needed for styling progress bars, sadly this can
only be done with these non-standard selectors. These are, hovever,
in use on real sites such as https://rpcs3.net/compatibility.

1 files changed, 4 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/CSS/Selector.cpp b/Userland/Libraries/LibWeb/CSS/Selector.cpp
index 5788972027..ca10a764ef 100644
--- a/Userland/Libraries/LibWeb/CSS/Selector.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Selector.cpp
@@ -352,6 +352,10 @@ Optional<Selector::PseudoElement> pseudo_element_from_string(StringView name)
         return Selector::PseudoElement::FirstLine;
     } else if (name.equals_ignoring_case("marker"sv)) {
         return Selector::PseudoElement::Marker;
+    } else if (name.equals_ignoring_case("-webkit-progress-bar"sv)) {
+        return Selector::PseudoElement::ProgressBar;
+    } else if (name.equals_ignoring_case("-webkit-progress-value"sv)) {
+        return Selector::PseudoElement::ProgressValue;
     }
     return {};
 }