diff --git a/apps/wpt/src/main.rs b/apps/wpt/src/main.rs
index 1ce26363..b8506632 100644
--- a/apps/wpt/src/main.rs
+++ b/apps/wpt/src/main.rs
@@ -490,18 +490,18 @@ fn main() {
     println!("{fail_count:>4} tests FAILED ({fail_percent_run:.2}% of run; {fail_percent_total:.2}% of found)");
 
     println!("{}", "\nOf those which failed:".bright_black());
+    println!("{other_fail_count:>4} do not use unsupported features");
+    println!("{writing_mode_fail_count:>4} use writing-mode");
+    println!("{direction_fail_count:>4} use direction");
+    println!("{float_fail_count:>4} use floats");
+    println!("{intrinsic_size_fail_count:>4} use intrinsic size keywords");
+    println!("{calc_fail_count:>4} use calc");
     if subgrid_fail_count > 0 {
         println!("{subgrid_fail_count:>4} use subgrid");
     }
     if masonry_fail_count > 0 {
         println!("{masonry_fail_count:>4} use masonry");
     }
-    println!("{writing_mode_fail_count:>4} use writing_mode");
-    println!("{direction_fail_count:>4} use direction");
-    println!("{calc_fail_count:>4} use calc");
-    println!("{intrinsic_size_fail_count:>4} use intrinsic size keywords");
-    println!("{float_fail_count:>4} use floats");
-    println!("{other_fail_count:>4} do not use unsupported features");
 }
 
 #[allow(clippy::too_many_arguments)]
@@ -548,6 +548,7 @@ async fn process_test_file(
             relative_path,
             file_contents.as_str(),
             reference.as_str(),
+            &mut flags,
         )
         .await;
 
diff --git a/apps/wpt/src/ref_test.rs b/apps/wpt/src/ref_test.rs
index bdd800aa..8166a7bd 100644
--- a/apps/wpt/src/ref_test.rs
+++ b/apps/wpt/src/ref_test.rs
@@ -10,7 +10,7 @@ use std::io::Write;
 use std::path::Path;
 use std::sync::Arc;
 
-use crate::{clone_font_ctx, BufferKind, TestStatus, ThreadCtx, HEIGHT, WIDTH};
+use crate::{clone_font_ctx, BufferKind, TestFlags, TestStatus, ThreadCtx, HEIGHT, WIDTH};
 
 #[allow(clippy::too_many_arguments)]
 pub async fn process_ref_test(
@@ -18,6 +18,7 @@ pub async fn process_ref_test(
     test_relative_path: &str,
     test_html: &str,
     ref_file: &str,
+    flags: &mut TestFlags,
 ) -> TestStatus {
     let ref_url: Url = ctx
         .dummy_base_url
@@ -29,6 +30,28 @@ pub async fn process_ref_test(
     let ref_path = ctx.wpt_dir.join(&ref_relative_path);
     let ref_html = fs::read_to_string(ref_path).expect("Ref file not found.");
 
+    if ctx.float_re.is_match(&ref_html) {
+        *flags |= TestFlags::USES_FLOAT;
+    }
+    if ctx.intrinsic_re.is_match(&ref_html) {
+        *flags |= TestFlags::USES_INTRINSIC_SIZE;
+    }
+    if ctx.calc_re.is_match(&ref_html) {
+        *flags |= TestFlags::USES_CALC;
+    }
+    if ctx.direction_re.is_match(&ref_html) {
+        *flags |= TestFlags::USES_DIRECTION;
+    }
+    if ctx.writing_mode_re.is_match(&ref_html) {
+        *flags |= TestFlags::USES_WRITING_MODE;
+    }
+    if ctx.subgrid_re.is_match(&ref_html) {
+        *flags |= TestFlags::USES_SUBGRID;
+    }
+    if ctx.masonry_re.is_match(&ref_html) {
+        *flags |= TestFlags::USES_MASONRY;
+    }
+
     let test_out_path = ctx
         .out_dir
         .join(format!("{}{}", test_relative_path, "-test.png"));