TypeScript Lab: Table Scope Repair

LAB / EXPLORATION

TypeScript Lab: Table Scope Repair

Planned

LAB 078 — Semantic HTML
Assign column and row scope to structural table headers.

LAB TypeScript Lab: Table Scope Repair Preview coming soon

LAB 078

TypeScript Lab: Table Scope Repair

Concept

Table position provides safe information for inferring missing header scope.

Concept

Table position provides safe information for inferring missing header scope.

Objective & Explanation

What the project should make visible and why the concept matters.

Learning Target

Objective

Assign column and row scope to structural table headers.

Explanation

Table position provides safe information for inferring missing header scope.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── index.html
├── styles.css
└── src/
    └── app.ts

Technologies

TypeScript
DOM
HTML
CSS

Data Layer

No persistent data layer. Keep all demonstration values inside the standalone project.

Sandbox Source

src/local-editor/client.ts → semanticAssistHtml()

Build Instructions

Build only the focused behavior, then use the visual layer to inspect it.

Setup

Create the standalone project folder and listed files.

Implement

Implement the smallest version that demonstrates the concept.

Run & Inspect

Change one input and observe the visible output change.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

document.querySelectorAll("thead th").forEach(cell => {
  if (!cell.hasAttribute("scope")) cell.setAttribute("scope", "col");
});

document.querySelectorAll("tbody th").forEach(cell => {
  if (!cell.hasAttribute("scope")) cell.setAttribute("scope", "row");
});

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": { "build": "tsc" },
  "devDependencies": { "typescript": "^7.0.2" }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "strict": true,
    "sourceMap": true
  },
  "include": ["src/**/*.ts"]
}

Expected Visual Result

The output is the proof that the concept is working.

Visible Proof

The browser should visibly demonstrate: assign column and row scope to structural table headers.

Data: None