diff --git a/Tests/LibWeb/Layout/expected/css-pseudo-element-blockification.txt b/Tests/LibWeb/Layout/expected/css-pseudo-element-blockification.txt
new file mode 100644
index 0000000000..03ec5cf771
--- /dev/null
+++ b/Tests/LibWeb/Layout/expected/css-pseudo-element-blockification.txt
@@ -0,0 +1,19 @@
+Viewport <#document> at (0,0) content-size 800x600 children: not-inline
+ BlockContainer at (0,0) content-size 800x33.46875 children: not-inline
+ BlockContainer
at (8,8) content-size 784x17.46875 children: not-inline
+ Box at (8,8) content-size 784x17.46875 flex-container(row) children: not-inline
+ BlockContainer <(anonymous)> at (8,8) content-size 28.40625x17.46875 flex-item children: inline
+ line 0 width: 28.40625, height: 17.46875, bottom: 17.46875, baseline: 13.53125
+ frag 0 from TextNode start: 0, length: 4, rect: [8,8 28.40625x17.46875]
+ "well"
+ TextNode <#text>
+ BlockContainer <(anonymous)> at (46,8) content-size 36.84375x17.46875 flex-item children: inline
+ line 0 width: 36.84375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
+ frag 0 from TextNode start: 0, length: 5, rect: [46,8 36.84375x17.46875]
+ "hello"
+ TextNode <#text>
+ BlockContainer <(anonymous)> at (92.4375,8) content-size 55.359375x17.46875 flex-item children: inline
+ line 0 width: 55.359375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
+ frag 0 from TextNode start: 0, length: 7, rect: [92.4375,8 55.359375x17.46875]
+ "friends"
+ TextNode <#text>
diff --git a/Tests/LibWeb/Layout/input/css-pseudo-element-blockification.html b/Tests/LibWeb/Layout/input/css-pseudo-element-blockification.html
new file mode 100644
index 0000000000..949f48e96f
--- /dev/null
+++ b/Tests/LibWeb/Layout/input/css-pseudo-element-blockification.html
@@ -0,0 +1,15 @@
+hello
\ No newline at end of file
diff --git a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
index 512f619263..29636cf5ab 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
@@ -1425,7 +1425,7 @@ enum class BoxTypeTransformation {
Inlinify,
};
-static BoxTypeTransformation required_box_type_transformation(StyleProperties const& style, DOM::Element const& element, Optional const&)
+static BoxTypeTransformation required_box_type_transformation(StyleProperties const& style, DOM::Element const& element, Optional const& pseudo_element)
{
// Absolute positioning or floating an element blockifies the box’s display type. [CSS2]
if (style.position() == CSS::Position::Absolute || style.position() == CSS::Position::Fixed || style.float_() != CSS::Float::None)
@@ -1433,9 +1433,12 @@ static BoxTypeTransformation required_box_type_transformation(StyleProperties co
// FIXME: Containment in a ruby container inlinifies the box’s display type, as described in [CSS-RUBY-1].
+ // NOTE: If we're computing style for a pseudo-element, the effective parent will be the originating element itself, not its parent.
+ auto const* parent = pseudo_element.has_value() ? &element : element.parent_element();
+
// A parent with a grid or flex display value blockifies the box’s display type. [CSS-GRID-1] [CSS-FLEXBOX-1]
- if (element.parent_element() && element.parent_element()->computed_css_values()) {
- auto const& parent_display = element.parent_element()->computed_css_values()->display();
+ if (parent && parent->computed_css_values()) {
+ auto const& parent_display = parent->computed_css_values()->display();
if (parent_display.is_grid_inside() || parent_display.is_flex_inside())
return BoxTypeTransformation::Blockify;
}