<!-- apostl-public-identity: {"run_id":null,"run_public_id":null,"report_slug":"0d071cf7-e23c-4074-8a42-b46e748a8faa"} -->
# W3Schools: HTML Introduction

**Status:** Reached first value

The documented first HTML page rendered with heading and paragraph.

**Source:** https://www.w3schools.com/html/html\_intro.asp
**Mode:** First blocker

## Journey Milestones

### 01. Understand HTML

- Status: Completed
- Outcome: The source states HTML is the standard markup language for creating web pages and describes page structure.

| Step | Status | Expected | Observed | Decision |
|---|---|---|---|---|
| Review HTML purpose | Completed | Reader understands that HTML is the standard markup language for creating web pages. | The source states HTML is the standard markup language for creating web pages and describes page structure. | Continue to the documented simple HTML document. |

### 02. Create HTML document

- Status: Completed
- Outcome: index.html contains the documented title, heading, and paragraph.

| Step | Status | Expected | Observed | Decision |
|---|---|---|---|---|
| Create simple HTML document | Completed | The file contains the documented Page Title, My First Heading, and My first paragraph. | index.html contains the documented title, heading, and paragraph. | Render the local page in a browser. |

### 03. Render HTML page

- Status: Completed
- Outcome: agent-browser read showed My First Heading and My first paragraph; screenshot captured the rendered page.

| Step | Status | Expected | Observed | Decision |
|---|---|---|---|---|
| Render HTML document | Completed | A browser renders the documented heading and paragraph. | agent-browser read showed My First Heading and My first paragraph; screenshot captured the rendered page. | Expected user-visible success signal was captured; stop tutorial work and finalize. |

## Verified working quickstart

### 1. Review HTML purpose

The source states HTML is the standard markup language for creating web pages and describes page structure.

**Decision:** Continue to the documented simple HTML document.

### 2. Create simple HTML document

index.html contains the documented title, heading, and paragraph.

**Decision:** Render the local page in a browser.

**Verified command:** Created index.html with the documented HTML skeleton and visible content.

```sh
Create index.html from the W3Schools simple HTML document example
```

**Result:** index.html contains \<title\>Page Title\</title\>, \<h1\>My First Heading\</h1\>, and \<p\>My first paragraph.\</p\>.

**Verified command:** Static check found the documented title, heading, and paragraph.

```sh
grep documented title, heading, and paragraph in index.html
```

**Result:** \<h1\>My First Heading\</h1\>; \<p\>My first paragraph.\</p\>; \<title\>Page Title\</title\>

### 3. Render HTML document

agent-browser read showed My First Heading and My first paragraph; screenshot captured the rendered page.

**Decision:** Expected user-visible success signal was captured; stop tutorial work and finalize.

**Verified command:** Started a local static server for index.html.

```sh
python3 -m http.server 8765 --bind 127.0.0.1
```

**Result:** Static server listening on http://127.0.0.1:8765/ under timeout supervision.

**Verified command:** Local HTTP response returned the documented HTML page.

```sh
curl http://127.0.0.1:8765/index.html
```

**Result:** \<!DOCTYPE html\> ... \<h1\>My First Heading\</h1\> \<p\>My first paragraph.\</p\>

**Verified command:** agent-browser opened the local page and captured screenshot proof.

```sh
agent-browser open, snapshot --json, and screenshot http://127.0.0.1:8765/index.html
```

**Result:** agent-browser DOM snapshot: heading 'My First Heading'; agent-browser screenshot artifacts/w3schools-html-page.png saved.

**Verified command:** Rendered text included the documented heading and paragraph.

```sh
agent-browser read rendered page
```

**Result:** \# My First Heading My first paragraph.

## Evidence


### Run cost

- Estimated API list price: $3.79
- Tokens used: 3,338,485
- Token rates: $5.00 per million uncached input tokens, $0.50 per million cached input tokens, and $30.00 per million output tokens.
- Pricing: GPT-5.5 list-price benchmark
- Pricing effective: 2026-04-24
- Long-context note: We could not see the largest single prompt. If it passed 272,000 input tokens, the estimate could be up to $6.91.
- Method: Estimate based on public API prices. It is not your provider invoice.

### Source

- Source guide: https://www.w3schools.com/html/html\_intro.asp

### Command evidence

| ID | Summary | Status | Command | Output excerpt |
|---|---|---|---|---|
| cmd-create-html-document | Created index.html with the documented HTML skeleton and visible content. | Completed | Create index.html from the W3Schools simple HTML document example | index.html contains \<title\>Page Title\</title\>, \<h1\>My First Heading\</h1\>, and \<p\>My first paragraph.\</p\>. |
| cmd-static-html-check | Static check found the documented title, heading, and paragraph. | Completed | grep documented title, heading, and paragraph in index.html | \<h1\>My First Heading\</h1\>; \<p\>My first paragraph.\</p\>; \<title\>Page Title\</title\> |
| cmd-start-static-server | Started a local static server for index.html. | Completed | python3 -m http.server 8765 --bind 127.0.0.1 | Static server listening on http://127.0.0.1:8765/ under timeout supervision. |
| cmd-local-http-check | Local HTTP response returned the documented HTML page. | Completed | curl http://127.0.0.1:8765/index.html | \<!DOCTYPE html\> ... \<h1\>My First Heading\</h1\> \<p\>My first paragraph.\</p\> |
| cmd-agent-browser-render | agent-browser opened the local page and captured screenshot proof. | Completed | agent-browser open, snapshot --json, and screenshot http://127.0.0.1:8765/index.html | agent-browser DOM snapshot: heading 'My First Heading'; agent-browser screenshot artifacts/w3schools-html-page.png saved. |
| cmd-agent-browser-read | Rendered text included the documented heading and paragraph. | Completed | agent-browser read rendered page | # My First Heading My first paragraph. |

### Integrity

- Proof manifest SHA-256: e06e69d6dc5a9e477b2dd1583426209a4cf43281fc8f11e098a2a45f2df1b0e8
- Proof manifest bytes: 892641

### Public artifact links

- [Screenshot: W3Schools Html Page](https://platform.apostl.dev/reports/0d071cf7-e23c-4074-8a42-b46e748a8faa/artifacts/w3schools-html-page.png)
- [Command log: W3Schools Html Dom](https://platform.apostl.dev/reports/0d071cf7-e23c-4074-8a42-b46e748a8faa/artifacts/w3schools-html-dom.json)
- [Command log: W3Schools Html Read](https://platform.apostl.dev/reports/0d071cf7-e23c-4074-8a42-b46e748a8faa/artifacts/w3schools-html-read.txt)