diff --git a/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp b/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp
index 0ac05c64444..7dea984d7fd 100644
--- a/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp
+++ b/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp
@@ -7,6 +7,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibURL/Parser.h>
 #include <LibWeb/CSS/ComputedValues.h>
 #include <LibWeb/CSS/Fetch.h>
 #include <LibWeb/CSS/StyleValues/ImageStyleValue.h>
@@ -182,4 +183,33 @@ void ImageStyleValue::set_style_sheet(GC::Ptr<CSSStyleSheet> style_sheet)
     m_style_sheet = style_sheet;
 }
 
+ValueComparingNonnullRefPtr<CSSStyleValue const> ImageStyleValue::absolutized(CSSPixelRect const&, Length::FontMetrics const&, Length::FontMetrics const&) const
+{
+    if (m_url.url().is_empty())
+        return *this;
+
+    // FIXME: The spec has been updated to handle this better. The computation of the base URL here is roughly based on:
+    //        https://drafts.csswg.org/css-values-4/#style-resource-base-url
+    //        https://github.com/w3c/csswg-drafts/pull/12261
+    auto base_url = [&]() -> Optional<::URL::URL> {
+        if (m_style_sheet) {
+            return m_style_sheet->base_url()
+                .value_or_lazy_evaluated_optional([&]() { return m_style_sheet->location(); })
+                .value_or_lazy_evaluated_optional([&]() { return HTML::relevant_settings_object(*m_style_sheet).api_base_url(); });
+        }
+
+        if (m_document)
+            return m_document->base_url();
+
+        return {};
+    }();
+
+    if (base_url.has_value()) {
+        if (auto resolved_url = ::URL::Parser::basic_parse(m_url.url(), *base_url); resolved_url.has_value())
+            return ImageStyleValue::create(*resolved_url);
+    }
+
+    return *this;
+}
+
 }
diff --git a/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.h b/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.h
index 5ae0b6913ad..94ee15eac53 100644
--- a/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.h
+++ b/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.h
@@ -53,6 +53,7 @@ private:
     ImageStyleValue(URL const&);
 
     virtual void set_style_sheet(GC::Ptr<CSSStyleSheet>) override;
+    virtual ValueComparingNonnullRefPtr<CSSStyleValue const> absolutized(CSSPixelRect const& viewport_rect, Length::FontMetrics const& font_metrics, Length::FontMetrics const& root_font_metrics) const override;
 
     void animate();
     Gfx::ImmutableBitmap const* bitmap(size_t frame_index, Gfx::IntSize = {}) const;
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-base.sub.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-base.sub.txt
index a5813c16f8b..225a265d1e1 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-base.sub.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-base.sub.txt
@@ -2,6 +2,7 @@ Harness status: OK
 
 Found 2 tests
 
-2 Fail
-Fail	base-relative URL: relative-image-url
+1 Pass
+1 Fail
+Pass	base-relative URL: relative-image-url
 Fail	base-relative URL: relative-image-variable-url
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-stylesheet.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-stylesheet.txt
index 3bd7e184d55..2a6ff96d061 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-stylesheet.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-values/urls/resolve-relative-to-stylesheet.txt
@@ -2,7 +2,8 @@ Harness status: OK
 
 Found 3 tests
 
-3 Fail
-Fail	stylesheet-relative URL: stylesheet-relative-image
+1 Pass
+2 Fail
+Pass	stylesheet-relative URL: stylesheet-relative-image
 Fail	stylesheet-relative URL: stylesheet-relative-variable-image
 Fail	stylesheet-relative URL: stylesheet-relative-document-variable-image
\ No newline at end of file