LibWeb: Use layout-test-mode for layout tests

Also do some test changes to test it out :^)

Tests/LibWeb/Layout/input/grid/auto-fill.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/auto-fit.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/basic.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/borders.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/different-column-sizes.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/gap.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/grid-template.html

@@ -1,7 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
   .mw-page-container-inner {
     display: grid;
     grid-template: min-content min-content 1fr min-content / 12.25em minmax(0, 1fr);

Tests/LibWeb/Layout/input/grid/image-in-grid.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/intrinsic-sized-column.html

@@ -5,7 +5,6 @@
   <style>
     body {
       float: left;
-      font-family: 'SerenitySans';
     }
 
     .grid {

Tests/LibWeb/Layout/input/grid/intrinsic-sized-grid.html

@@ -4,7 +4,6 @@
   }
   body {
     float: left;
-    font-family: 'SerenitySans';
   }
   .grid {
     display: grid;

Tests/LibWeb/Layout/input/grid/min-max-content.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/minmax.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/named-tracks.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/positions-and-spans.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/repeat.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/row-height.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/input/grid/template-areas.html

@@ -1,8 +1,4 @@
 <style>
-  body {
-    font-family: 'SerenitySans';
-  }
-
   .grid-container {
     display: grid;
     background-color: lightsalmon;

Tests/LibWeb/Layout/layout_test.sh

@@ -16,7 +16,7 @@ find "${SCRIPT_DIR}/input/" -type f -name "*.html" -print0 | while IFS= read -r
     input_html_file=${input_html_path/${SCRIPT_DIR}"/input/"/}
     input_html_file=${input_html_file/".html"/}
 
-    output_layout_dump=$(cd "${LADYBIRD_BUILD_DIR}"; timeout 300s "${BROWSER_BINARY}" -d "${input_html_path}")
+    output_layout_dump=$(cd "${LADYBIRD_BUILD_DIR}"; timeout 300s "${BROWSER_BINARY}" --layout-test-mode -d "${input_html_path}")
     expected_layout_dump_path="${SCRIPT_DIR}/expected/${input_html_file}.txt"
 
     if cmp <(echo "${output_layout_dump}") "${expected_layout_dump_path}"; then