diff --git a/html/html.ts b/html/html.ts
index 3f8f8cd..d8130dc 100644
--- a/html/html.ts
+++ b/html/html.ts
@@ -83,14 +83,21 @@ function indent(str: string, amount = 4, char = " "): string {
     .join("\n");
 }
 
+// incomplete, obviously.
+const NON_SELF_CLOSING = ["div", "p", "a"];
+
 function render_elem(
   { tag, attributes, children }: NonText,
   mini = false,
 ): string {
   if (children.length == 0) {
-    return (
-      `<${tag}${render_attributes(attributes)}` + (mini ? "/>" : " />")
-    );
+    if (!NON_SELF_CLOSING.includes(tag)) {
+      return (
+        `<${tag}${render_attributes(attributes)}` + (mini ? "/>" : " />")
+      );
+    } else {
+      return `<${tag}${render_attributes(attributes)}></${tag}>`;
+    }
   } else {
     let inner = "";
     let string_last = false;
diff --git a/html/jsx/jsx-runtime.ts b/html/jsx/jsx-runtime.ts
index 2755424..b8e88c4 100644
--- a/html/jsx/jsx-runtime.ts
+++ b/html/jsx/jsx-runtime.ts
@@ -1,11 +1,15 @@
-import { Attributes, fr, Html, Prop } from "../html.ts";
+import { fr, Html, Prop } from "../html.ts";
 
 type SadProp = Prop | undefined | Html | Html[];
 export type Component = (
-  attributes: Attributes,
+  props: CProps,
   children: Html[],
 ) => Html;
 
+export type CProps = {
+  [key: string]: any;
+};
+
 interface Props {
   [key: string]: typeof key extends "children" ? never : SadProp;
   children: undefined | Html | Html[];
@@ -16,12 +20,14 @@ export function create_element(
   props_?: Props,
 ): Html {
   const props: Props = props_ ?? { children: [] };
-  const children: Html[] = [props.children ?? []].flat();
-  const attributes: Attributes = {};
+  const children: Html[] = [props.children ?? []].flat().filter((c) =>
+    typeof c == "string" || typeof c == "object"
+  );
+  const attributes: CProps = {};
 
   for (const [key, val] of Object.entries(props)) {
     if (
-      key == "children" || typeof val == "undefined" || typeof val == "object"
+      key == "children" || typeof val == "undefined"
     ) continue;
     attributes[key] = val;
   }
diff --git a/html/ttt.tsx b/html/ttt.tsx
index 3321a9c..571fa30 100644
--- a/html/ttt.tsx
+++ b/html/ttt.tsx
@@ -1,2 +1,77 @@
-import { Html, render } from "./html.ts";
+import { Html, debug_render } from "./html.ts";
 import { Component } from "./jsx/jsx-runtime.ts";
+
+type Square = "x" | "o" | "empty";
+type Row = [Square, Square, Square];
+type Board = [Row, Row, Row];
+type SquareIdx = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8;
+
+const empty_row: Row = ["empty", "empty", "empty"];
+const empty_board: Board = [empty_row, empty_row, empty_row];
+//{ board: [r1, r2, r3] }
+
+const square_of_turn = (turn: number): Square => (turn % 2 == 0 ? "x" : "o");
+function game_over([[s1, s2, s3], [s4, s5, s6], [s7, s8, s9]]: Board): boolean {
+    return true;
+}
+
+// TODO: strike out and such
+const Board: Component = ({ board, turn = 0 }) => (
+    <div class="state">
+        {game_over(board) ? (
+            <div class="whose-turn game-over">Game over!</div>
+        ) : (
+            <div class="whose-turn">It's {square_of_turn(turn)}'s turn!</div>
+        )}
+        <div class="board">
+            <Row board={board} idx={0} turn={turn} />
+            <Row board={board} idx={1} turn={turn} />
+            <Row board={board} idx={2} turn={turn} />
+        </div>
+    </div>
+);
+
+const Row: Component = ({ board, idx, turn }) => (
+    <div class="row">
+        <Cell board={board} idx={idx + 0} turn={turn} />
+        <Cell board={board} idx={idx + 1} turn={turn} />
+        <Cell board={board} idx={idx + 2} turn={turn} />
+    </div>
+);
+
+const Cell: Component = ({ board, idx, turn }) => {
+    const square = get_square(board, idx);
+    return square == "empty" && turn != "game over" ? (
+        <details class="cell empty">
+            <summary></summary>
+            <SuccBoard board={board} idx={idx} turn={turn} />
+        </details>
+    ) : (
+        <div class={`cell ${square}`}>{square != "empty" && square}</div>
+    );
+};
+
+const SuccBoard: Component = ({ board, idx, turn }) => {
+    const square = square_of_turn(turn);
+
+    return (
+        <Board
+            board={set_square(board, idx, square)}
+            turn={game_over(board) ? "game over" : turn + 1}
+        />
+    );
+};
+
+function get_square(board: Board, idx: SquareIdx): Square {
+    return board[Math.floor(idx / 3)][idx % 3];
+}
+
+function set_square(board: Board, idx: SquareIdx, to: Square): Board {
+    const new_board = JSON.parse(JSON.stringify(board)) as Board;
+
+    new_board[Math.floor(idx / 3)][idx % 3] = to;
+
+    return new_board;
+}
+
+debug_render(<Board board={set_square(empty_board, 4, "x")} />);