diff --git a/Tests/LibWeb/Layout/expected/line-height-calc-number.txt b/Tests/LibWeb/Layout/expected/line-height-calc-number.txt
new file mode 100644
index 0000000000..0870df18e4
--- /dev/null
+++ b/Tests/LibWeb/Layout/expected/line-height-calc-number.txt
@@ -0,0 +1,8 @@
+Viewport <#document> at (0,0) content-size 800x600 children: not-inline
+ BlockContainer at (0,0) content-size 800x80 [BFC] children: not-inline
+ BlockContainer
at (8,8) content-size 784x64 children: not-inline
+ BlockContainer at (8,8) content-size 784x64 children: inline
+ line 0 width: 100.203125, height: 64, bottom: 64, baseline: 36.796875
+ frag 0 from TextNode start: 0, length: 13, rect: [8,8 100.203125x64]
+ "hello friends"
+ TextNode <#text>
diff --git a/Tests/LibWeb/Layout/input/line-height-calc-number.html b/Tests/LibWeb/Layout/input/line-height-calc-number.html
new file mode 100644
index 0000000000..c19673dba8
--- /dev/null
+++ b/Tests/LibWeb/Layout/input/line-height-calc-number.html
@@ -0,0 +1,6 @@
+
hello friends
\ No newline at end of file
diff --git a/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp b/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
index 3c638dac48..403700d462 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
@@ -219,6 +219,15 @@ CSSPixels StyleProperties::line_height(Layout::Node const& layout_node) const
}
if (line_height->is_calculated()) {
+ if (line_height->as_calculated().resolves_to_number()) {
+ auto resolved = line_height->as_calculated().resolve_number();
+ if (!resolved.has_value()) {
+ dbgln("FIXME: Failed to resolve calc() line-height (number): {}", line_height->as_calculated().to_string().release_value_but_fixme_should_propagate_errors());
+ return layout_node.font().pixel_metrics().line_spacing();
+ }
+ return Length(resolved.value(), Length::Type::Em).to_px(layout_node);
+ }
+
auto resolved = line_height->as_calculated().resolve_length(layout_node);
if (!resolved.has_value()) {
dbgln("FIXME: Failed to resolve calc() line-height: {}", line_height->as_calculated().to_string().release_value_but_fixme_should_propagate_errors());