diff --git a/src/terminal/Terminal.zig b/src/terminal/Terminal.zig
index e47574b19..e845c6e46 100644
--- a/src/terminal/Terminal.zig
+++ b/src/terminal/Terminal.zig
@@ -1452,7 +1452,6 @@ pub fn horizontalTabBack(self: *Terminal) !void {
 }
 
 /// Clear tab stops.
-/// TODO: test
 pub fn tabClear(self: *Terminal, cmd: csi.TabClear) void {
     switch (cmd) {
         .current => self.tabstops.unset(self.screen.cursor.x),
@@ -1702,7 +1701,6 @@ pub fn deleteLines(self: *Terminal, count: usize) !void {
 }
 
 /// Scroll the text down by one row.
-/// TODO: test
 pub fn scrollDown(self: *Terminal, count: usize) !void {
     const tracy = trace(@src());
     defer tracy.end();
@@ -5367,3 +5365,101 @@ test "Terminal: cursorRight right of right margin" {
         try testing.expectEqualStrings("    X", str);
     }
 }
+
+test "Terminal: scrollDown simple" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    try t.printString("ABC");
+    t.carriageReturn();
+    try t.linefeed();
+    try t.printString("DEF");
+    t.carriageReturn();
+    try t.linefeed();
+    try t.printString("GHI");
+    t.setCursorPos(2, 2);
+    const cursor = t.screen.cursor;
+    try t.scrollDown(1);
+    try testing.expectEqual(cursor, t.screen.cursor);
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("\nABC\nDEF\nGHI", str);
+    }
+}
+
+test "Terminal: scrollDown outside of scroll region" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    try t.printString("ABC");
+    t.carriageReturn();
+    try t.linefeed();
+    try t.printString("DEF");
+    t.carriageReturn();
+    try t.linefeed();
+    try t.printString("GHI");
+    t.setScrollingRegion(3, 4);
+    t.setCursorPos(2, 2);
+    const cursor = t.screen.cursor;
+    try t.scrollDown(1);
+    try testing.expectEqual(cursor, t.screen.cursor);
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("ABC\nDEF\n\nGHI", str);
+    }
+}
+
+test "Terminal: scrollDown left/right scroll region" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 10, 10);
+    defer t.deinit(alloc);
+
+    try t.printString("ABC123");
+    t.carriageReturn();
+    try t.linefeed();
+    try t.printString("DEF456");
+    t.carriageReturn();
+    try t.linefeed();
+    try t.printString("GHI789");
+    t.scrolling_region.left = 1;
+    t.scrolling_region.right = 3;
+    t.setCursorPos(2, 2);
+    const cursor = t.screen.cursor;
+    try t.scrollDown(1);
+    try testing.expectEqual(cursor, t.screen.cursor);
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("A   23\nDBC156\nGEF489\n HI7", str);
+    }
+}
+
+test "Terminal: tabClear single" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 30, 5);
+    defer t.deinit(alloc);
+
+    try t.horizontalTab();
+    t.tabClear(.current);
+    t.setCursorPos(1, 1);
+    try t.horizontalTab();
+    try testing.expectEqual(@as(usize, 16), t.screen.cursor.x);
+}
+
+test "Terminal: tabClear all" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 30, 5);
+    defer t.deinit(alloc);
+
+    t.tabClear(.all);
+    t.setCursorPos(1, 1);
+    try t.horizontalTab();
+    try testing.expectEqual(@as(usize, 29), t.screen.cursor.x);
+}
diff --git a/src/terminal/stream.zig b/src/terminal/stream.zig
index ecc599a98..cf7f16ab5 100644
--- a/src/terminal/stream.zig
+++ b/src/terminal/stream.zig
@@ -1102,6 +1102,11 @@ pub fn Stream(comptime Handler: type) type {
                     },
                 } else log.warn("unimplemented invokeCharset: {}", .{action}),
 
+                // DECID
+                'Z' => if (@hasDecl(T, "deviceAttributes")) {
+                    try self.handler.deviceAttributes(.primary, &.{});
+                } else log.warn("unimplemented ESC callback: {}", .{action}),
+
                 // RIS - Full Reset
                 'c' => if (@hasDecl(T, "fullReset")) switch (action.intermediates.len) {
                     0 => try self.handler.fullReset(),
diff --git a/website/app/vt/sd/page.mdx b/website/app/vt/sd/page.mdx
new file mode 100644
index 000000000..bdd685295
--- /dev/null
+++ b/website/app/vt/sd/page.mdx
@@ -0,0 +1,15 @@
+import VTSequence from "@/components/VTSequence";
+
+# Scroll Down (SD)
+
+<VTSequence sequence={["CSI", "Pn", "T"]} />
+
+Inserts `n` lines at the top of the scroll region and shift existing
+lines down.
+
+This sequence is functionally identical to
+[Insert Line (IL)](/vt/il) with the cursor position set to the top of
+the scroll region. The cursor position after the operation must be unchanged
+from when SD was invoked.
+
+This sequence unsets the pending wrap state.
diff --git a/website/app/vt/tbc/page.mdx b/website/app/vt/tbc/page.mdx
new file mode 100644
index 000000000..acb39330b
--- /dev/null
+++ b/website/app/vt/tbc/page.mdx
@@ -0,0 +1,47 @@
+import VTSequence from "@/components/VTSequence";
+
+# Tab Clear (TBC)
+
+<VTSequence sequence={["CSI", "Pn", "g"]} />
+
+Clear one or all tab stops.
+
+The parameter `n` must be `0` or `3`. If `n` is omitted, `n` defaults to `0`.
+
+If the parameter `n` is `0`, the cursor column position is marked as
+not a tab stop. If the column was already not a tab stop, this does nothing.
+
+If the parameter `n` is `3`, all tab stops are cleared.
+
+## Validation
+
+### TBC V-1: Tab Clear Single
+
+```bash
+printf "\033[1;1H" # move to top-left
+printf "\033[0J" # clear screen
+printf "\033[?W" # reset tabs
+printf "\t"
+printf "\033[g"
+printf "\033[1G"
+printf "\t"
+```
+
+```
+|_______________c_______|
+```
+
+### TBC V-3: Clear All Tabstops
+
+```bash
+printf "\033[1;1H" # move to top-left
+printf "\033[0J" # clear screen
+printf "\033[?W" # reset tabs
+printf "\033[3g"
+printf "\033[1G"
+printf "\t"
+```
+
+```
+|______________________c|
+```