diff --git a/libraries/exoplayer/src/test/java/androidx/media3/exoplayer/text/DelegatingSubtitleDecoderTtmlParserTest.java b/libraries/exoplayer/src/test/java/androidx/media3/exoplayer/text/DelegatingSubtitleDecoderTtmlParserTest.java
index cc2a942d83..adf392fc11 100644
--- a/libraries/exoplayer/src/test/java/androidx/media3/exoplayer/text/DelegatingSubtitleDecoderTtmlParserTest.java
+++ b/libraries/exoplayer/src/test/java/androidx/media3/exoplayer/text/DelegatingSubtitleDecoderTtmlParserTest.java
@@ -505,8 +505,8 @@ public final class DelegatingSubtitleDecoderTtmlParserTest {
     Cue cue = getOnlyCueAtTimeUs(subtitle, 1_000_000);
     assertThat(cue.text).isNull();
     assertThat(cue.bitmap).isNotNull();
-    assertThat(cue.position).isEqualTo(24f / 100f);
-    assertThat(cue.line).isEqualTo(28f / 100f);
+    assertThat(cue.position).isEqualTo(-24.2f / 100f);
+    assertThat(cue.line).isEqualTo(28.5f / 100f);
     assertThat(cue.size).isEqualTo(51f / 100f);
     assertThat(cue.bitmapHeight).isEqualTo(12f / 100f);
 
@@ -521,8 +521,8 @@ public final class DelegatingSubtitleDecoderTtmlParserTest {
     cue = getOnlyCueAtTimeUs(subtitle, 7_500_000);
     assertThat(cue.text).isNull();
     assertThat(cue.bitmap).isNotNull();
-    assertThat(cue.position).isEqualTo(24f / 100f);
-    assertThat(cue.line).isEqualTo(28f / 100f);
+    assertThat(cue.position).isEqualTo(-24.2f / 100f);
+    assertThat(cue.line).isEqualTo(28.5f / 100f);
     assertThat(cue.size).isEqualTo(51f / 100f);
     assertThat(cue.bitmapHeight).isEqualTo(12f / 100f);
   }
@@ -534,7 +534,7 @@ public final class DelegatingSubtitleDecoderTtmlParserTest {
     Cue cue = getOnlyCueAtTimeUs(subtitle, 1_000_000);
     assertThat(cue.text).isNull();
     assertThat(cue.bitmap).isNotNull();
-    assertThat(cue.position).isEqualTo(307f / 1280f);
+    assertThat(cue.position).isEqualTo(-307f / 1280f);
     assertThat(cue.line).isEqualTo(562f / 720f);
     assertThat(cue.size).isEqualTo(653f / 1280f);
     assertThat(cue.bitmapHeight).isEqualTo(86f / 720f);
diff --git a/libraries/extractor/src/main/java/androidx/media3/extractor/text/ttml/TtmlParser.java b/libraries/extractor/src/main/java/androidx/media3/extractor/text/ttml/TtmlParser.java
index d1e42f118c..d1d615657a 100644
--- a/libraries/extractor/src/main/java/androidx/media3/extractor/text/ttml/TtmlParser.java
+++ b/libraries/extractor/src/main/java/androidx/media3/extractor/text/ttml/TtmlParser.java
@@ -105,9 +105,9 @@ public final class TtmlParser implements SubtitleParser {
   private static final Pattern FONT_SIZE = Pattern.compile("^(([0-9]*.)?[0-9]+)(px|em|%)$");
   static final Pattern SIGNED_PERCENTAGE = Pattern.compile("^([-+]?\\d+\\.?\\d*?)%$");
   static final Pattern PERCENTAGE_COORDINATES =
-      Pattern.compile("^(\\d+\\.?\\d*?)% (\\d+\\.?\\d*?)%$");
+      Pattern.compile("^([-+]?\\d+\\.?\\d*?)% ([-+]?\\d+\\.?\\d*?)%$");
   private static final Pattern PIXEL_COORDINATES =
-      Pattern.compile("^(\\d+\\.?\\d*?)px (\\d+\\.?\\d*?)px$");
+      Pattern.compile("^([-+]?\\d+\\.?\\d*?)px ([-+]?\\d+\\.?\\d*?)px$");
   private static final Pattern CELL_RESOLUTION = Pattern.compile("^(\\d+) (\\d+)$");
 
   private static final int DEFAULT_FRAME_RATE = 30;
diff --git a/libraries/extractor/src/test/java/androidx/media3/extractor/text/ttml/TtmlParserTest.java b/libraries/extractor/src/test/java/androidx/media3/extractor/text/ttml/TtmlParserTest.java
index 08945d44d7..38cee01100 100644
--- a/libraries/extractor/src/test/java/androidx/media3/extractor/text/ttml/TtmlParserTest.java
+++ b/libraries/extractor/src/test/java/androidx/media3/extractor/text/ttml/TtmlParserTest.java
@@ -693,8 +693,8 @@ public final class TtmlParserTest {
     Cue cue = Iterables.getOnlyElement(allCues.get(0).cues);
     assertThat(cue.text).isNull();
     assertThat(cue.bitmap).isNotNull();
-    assertThat(cue.position).isEqualTo(24f / 100f);
-    assertThat(cue.line).isEqualTo(28f / 100f);
+    assertThat(cue.position).isEqualTo(-24.2f / 100f);
+    assertThat(cue.line).isEqualTo(28.5f / 100f);
     assertThat(cue.size).isEqualTo(51f / 100f);
     assertThat(cue.bitmapHeight).isEqualTo(12f / 100f);
 
@@ -713,8 +713,8 @@ public final class TtmlParserTest {
     cue = Iterables.getOnlyElement(allCues.get(2).cues);
     assertThat(cue.text).isNull();
     assertThat(cue.bitmap).isNotNull();
-    assertThat(cue.position).isEqualTo(24f / 100f);
-    assertThat(cue.line).isEqualTo(28f / 100f);
+    assertThat(cue.position).isEqualTo(-24.2f / 100f);
+    assertThat(cue.line).isEqualTo(28.5f / 100f);
     assertThat(cue.size).isEqualTo(51f / 100f);
     assertThat(cue.bitmapHeight).isEqualTo(12f / 100f);
   }
@@ -730,7 +730,7 @@ public final class TtmlParserTest {
     Cue cue = Iterables.getOnlyElement(allCues.get(0).cues);
     assertThat(cue.text).isNull();
     assertThat(cue.bitmap).isNotNull();
-    assertThat(cue.position).isEqualTo(307f / 1280f);
+    assertThat(cue.position).isEqualTo(-307f / 1280f);
     assertThat(cue.line).isEqualTo(562f / 720f);
     assertThat(cue.size).isEqualTo(653f / 1280f);
     assertThat(cue.bitmapHeight).isEqualTo(86f / 720f);
diff --git a/libraries/test_data/src/test/assets/media/ttml/bitmap_percentage_region.xml b/libraries/test_data/src/test/assets/media/ttml/bitmap_percentage_region.xml
index 9631650178..26d447ce83 100644
--- a/libraries/test_data/src/test/assets/media/ttml/bitmap_percentage_region.xml
+++ b/libraries/test_data/src/test/assets/media/ttml/bitmap_percentage_region.xml
@@ -14,8 +14,8 @@
         <layout>
             <region xml:id="region_0" tts:extent="51% 12%" tts:origin="24% 78%"/>
             <region xml:id="region_1" tts:extent="57% 6%" tts:origin="21% 85%"/>
-            <region xml:id="region_2" tts:extent="51% 12%" tts:origin="24% 28%"/>
-            <region xml:id="region_3" tts:extent="57% 6%" tts:origin="21% 35%"/>
+            <region xml:id="region_2" tts:extent="51% 12%" tts:origin="-24.2% 28.5%"/>
+            <region xml:id="region_3" tts:extent="57% 6%" tts:origin="21% +35%"/>
         </layout>
     </head>
     <body>
diff --git a/libraries/test_data/src/test/assets/media/ttml/bitmap_pixel_region.xml b/libraries/test_data/src/test/assets/media/ttml/bitmap_pixel_region.xml
index c724c46626..6bdb7ada63 100644
--- a/libraries/test_data/src/test/assets/media/ttml/bitmap_pixel_region.xml
+++ b/libraries/test_data/src/test/assets/media/ttml/bitmap_pixel_region.xml
@@ -12,8 +12,8 @@
             <style/>
         </styling>
         <layout>
-            <region xml:id="region_0" tts:extent="653px 86px" tts:origin="307px 562px"/>
-            <region xml:id="region_1" tts:extent="730px 43px" tts:origin="269px 612px"/>
+            <region xml:id="region_0" tts:extent="653px 86px" tts:origin="-307px 562px"/>
+            <region xml:id="region_1" tts:extent="730px 43px" tts:origin="269px +612px"/>
         </layout>
     </head>
     <body>