LibWeb: Add `ic` and `ric` Length units

Using the rough heuristic instead of the actual spec measurement. It's
allowed by the spec, but not ideal:

> In the cases where it is impossible or impractical to determine the
  ideographic advance measure, it must be assumed to be 1em.

2 files changed, 18 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/CSS/Length.cpp b/Userland/Libraries/LibWeb/CSS/Length.cpp
index 5a00d70c77..7657a2e557 100644
--- a/Userland/Libraries/LibWeb/CSS/Length.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Length.cpp
@@ -89,6 +89,12 @@ CSSPixels Length::relative_length_to_px(CSSPixelRect const& viewport_rect, FontM
         return m_value * font_metrics.zero_advance;
     case Type::Rch:
         return m_value * root_font_metrics.zero_advance;
+    case Type::Ic:
+        // FIXME: Use the "advance measure of the “水” (CJK water ideograph, U+6C34) glyph"
+        return m_value * font_metrics.font_size;
+    case Type::Ric:
+        // FIXME: Use the "advance measure of the “水” (CJK water ideograph, U+6C34) glyph"
+        return m_value * root_font_metrics.font_size;
     case Type::Lh:
         return m_value * font_metrics.line_height;
     case Type::Rlh:
@@ -158,6 +164,10 @@ char const* Length::unit_name() const
         return "ch";
     case Type::Rch:
         return "rch";
+    case Type::Ic:
+        return "ic";
+    case Type::Ric:
+        return "ric";
     case Type::Lh:
         return "lh";
     case Type::Rlh:
@@ -208,6 +218,10 @@ Optional<Length::Type> Length::unit_from_name(StringView name)
         return Length::Type::Ch;
     } else if (name.equals_ignoring_ascii_case("rch"sv)) {
         return Length::Type::Rch;
+    } else if (name.equals_ignoring_ascii_case("ic"sv)) {
+        return Length::Type::Ic;
+    } else if (name.equals_ignoring_ascii_case("ric"sv)) {
+        return Length::Type::Ric;
     } else if (name.equals_ignoring_ascii_case("lh"sv)) {
         return Length::Type::Lh;
     } else if (name.equals_ignoring_ascii_case("rlh"sv)) {
diff --git a/Userland/Libraries/LibWeb/CSS/Length.h b/Userland/Libraries/LibWeb/CSS/Length.h
index d7551f5786..ded6735393 100644
--- a/Userland/Libraries/LibWeb/CSS/Length.h
+++ b/Userland/Libraries/LibWeb/CSS/Length.h
@@ -26,6 +26,8 @@ public:
         Rcap,
         Ch,
         Rch,
+        Ic,
+        Ric,
         Lh,
         Rlh,
 
@@ -94,6 +96,8 @@ public:
             || m_type == Type::Rcap
             || m_type == Type::Ch
             || m_type == Type::Rch
+            || m_type == Type::Ic
+            || m_type == Type::Ric
             || m_type == Type::Lh
             || m_type == Type::Rlh;
     }