diff --git a/addons/addon-webgl/src/customGlyphs/CustomGlyphDefinitions.ts b/addons/addon-webgl/src/customGlyphs/CustomGlyphDefinitions.ts
index 1097f84f..3b3968cb 100644
--- a/addons/addon-webgl/src/customGlyphs/CustomGlyphDefinitions.ts
+++ b/addons/addon-webgl/src/customGlyphs/CustomGlyphDefinitions.ts
@@ -490,8 +490,8 @@ export const customGlyphDefinitions: { [index: string]: CustomGlyphCharacterDefi
   ] },
 
   // Diagonal fill characters (1FB98-1FB99)
-
-  // TODO: Implement
+  '\u{1FB98}': { type: CustomGlyphDefinitionType.PATH_FUNCTION_WITH_WEIGHT, data: { [FontWeight.NORMAL]: 'M0, 0 L1,1 M0,.25 L.75,1 M0,.5 L.5,1 M0,.75 L.25,1 M.25,0 L1,.75 M.5,0 L1,.5 M.75,0 L1,.25' } }, // UPPER LEFT TO LOWER RIGHT FILL
+  '\u{1FB99}': { type: CustomGlyphDefinitionType.PATH_FUNCTION_WITH_WEIGHT, data: { [FontWeight.NORMAL]: 'M0,.25 L.25,0 M0,.5 L.5,0 M0,.75 L.75,0 M0,1 L1,0 M.25,1 L1,.25 M.5,1 L1,.5 M.75,1 L1,.75' } }, // UPPER RIGHT TO LOWER LEFT FILL
 
   // Smooth mosaic terminal graphic characters (1FB9A-1FB9B)
 
@@ -506,8 +506,7 @@ export const customGlyphDefinitions: { [index: string]: CustomGlyphCharacterDefi
   // TODO: Implement
 
   // Light solid line with stroke (1FBAF-1FBAF)
-
-  // TODO: Implement
+  '\u{1FBAF}': { type: CustomGlyphDefinitionType.PATH_FUNCTION_WITH_WEIGHT, data: { [FontWeight.NORMAL]: `${Shapes.LEFT_TO_RIGHT} M.5,.35 L.5,.65` } }, // BOX DRAWINGS LIGHT HORIZONTAL WITH VERTICAL STROKE
 
   // Terminal graphic characters (1FBB0-1FBB3)
 
diff --git a/demo/client.ts b/demo/client.ts
index 6643f6be..f08cd1e3 100644
--- a/demo/client.ts
+++ b/demo/client.ts
@@ -828,13 +828,31 @@ function customGlyphAlignmentHandler(): void {
   term.write('  ║│╱ ╲│║  │║   ║│  ││ │ ││  │║ ┃ ║│  ┃│ ╽ │┃  ░░▒▒▓▓██ ┊  ┆ ╎ ╏  ┇ ┋ ▎\n\r');
   term.write('  ║└─╥─┘║  │╚═╤═╝│  │╘═╪═╛│  │╙─╀─╜│  ┃└─╂─┘┃  ░░▒▒▓▓██ ┊  ┆ ╎ ╏  ┇ ┋ ▏\n\r');
   term.write('  ╚══╩══╝  └──┴──┘  ╰──┴──╯  ╰──┴──╯  ┗━━┻━━┛           └╌╌┘ ╎ ┗╍╍┛ ┋  ▁▂▃▄▅▆▇█\n\r');
-  term.write('Smooth mosaic terminal graphic characters alignment tests:\x1b[33m\n\r');
+  term.write('\x1b[0mSmooth mosaic terminal graphic characters alignment tests:\x1b[33m\n\r');
   term.write('🭇🬼 🭈🬽 🭉🬾 🭊🬿 🭋🭀 🭁🭌 🭂🭍 🭃🭎 🭄🭏 🭅🭐 🭆🭑 🭨🭪 🭩 🭯 🭮🭬\n\r');
   term.write('🭢🭗 🭣🭘 🭤🭙 🭥🭚 🭦🭛 🭒🭝 🭓🭞 🭔🭟 🭕🭠 🭖🭡 🭧🭜    🭫 🭭\n\r');
   term.write(' 🭇🬼              🭉🬾 🭋🭀\n\r');
   term.write('🭊🭁🭌🬿 🭈🭆🭂🭍🭑🬽 🭇🭄🭏🬼 🭃🭎 🭅🭐 🭨🭪\n\r');
   term.write('🭥🭒🭝🭚 🭣🭧🭓🭞🭜🭘 🭢🭕🭠🭗 🭔🭟 🭖🭡 🭪🭨\n\r');
   term.write(' 🭢🭗              🭤🭙 🭦🭛\n\r');
+
+  term.write('\x1b[0mFill tests:\x1b[34m\n\r');
+  const fillChars = ['\u{2591}', '\u{2592}', '\u{2593}', '\u{1FB8C}', '\u{1FB8D}', '\u{1FB8E}', '\u{1FB8F}', '\u{1FB90}', '\u{1FB91}', '\u{1FB92}', '\u{1FB94}', '\u{1FB95}', '\u{1FB96}', '\u{1FB97}', '\u{1FB98}', '\u{1FB99}'];
+  while (fillChars.length > 0) {
+    const batch = fillChars.splice(0, 10);
+    for (const fillChar of batch) {
+      term.write(`${fillChar.codePointAt(0).toString(16).toUpperCase().padEnd(5, ' ')} `);
+    }
+    term.write('\n\r');
+    for (let i = 0; i < 3; i++) {
+      for (const fillChar of batch) {
+        term.write(fillChar.repeat(5));
+        term.write(' ');
+      }
+      term.write('\n\r');
+    }
+  }
+
   term.write('\x1b[0m');
   window.scrollTo(0, 0);
 }