Journey Milestones
M01Understand HTML
Outcome — The source states HTML is the standard markup language for creating web pages and describes page structure.
Understand HTML
Outcome — The source states HTML is the standard markup language for creating web pages and describes page structure.
- S01Review HTML purpose
- Expected
- Reader understands that HTML is the standard markup language for creating web pages.
- Observed
- 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.
M02Create HTML document
Outcome — index.html contains the documented title, heading, and paragraph.
Create HTML document
Outcome — index.html contains the documented title, heading, and paragraph.
- S01Create simple HTML document
- Expected
- The file contains the documented Page Title, My First Heading, and My first paragraph.
- Observed
- index.html contains the documented title, heading, and paragraph.
- Decision
- Render the local page in a browser.
CMD 01Created index.html with the documented HTML skeleton and visible content.CompletedInputCreate index.html from the W3Schools simple HTML document exampleOutputindex.html contains <title>Page Title</title>, <h1>My First Heading</h1>, and <p>My first paragraph.</p>.CMD 02Static check found the documented title, heading, and paragraph.CompletedInputgrep documented title, heading, and paragraph in index.htmlOutput<h1>My First Heading</h1>; <p>My first paragraph.</p>; <title>Page Title</title>
M03Render HTML page
Outcome — agent-browser read showed My First Heading and My first paragraph; screenshot captured the rendered page.
Render HTML page
Outcome — agent-browser read showed My First Heading and My first paragraph; screenshot captured the rendered page.
- S01Render HTML document
- Expected
- A browser renders the documented heading and paragraph.
- Observed
- 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.
ArtifactsCMD 01Started a local static server for index.html.CompletedInputpython3 -m http.server 8765 --bind 127.0.0.1OutputStatic server listening on http://127.0.0.1:8765/ under timeout supervision.CMD 02Local HTTP response returned the documented HTML page.CompletedInputcurl http://127.0.0.1:8765/index.htmlOutput<!DOCTYPE html> ... <h1>My First Heading</h1> <p>My first paragraph.</p>CMD 03agent-browser opened the local page and captured screenshot proof.CompletedInputagent-browser open, snapshot --json, and screenshot http://127.0.0.1:8765/index.htmlOutputagent-browser DOM snapshot: heading 'My First Heading'; agent-browser screenshot artifacts/w3schools-html-page.png saved.CMD 04Rendered text included the documented heading and paragraph.CompletedInputagent-browser read rendered pageOutput# My First Heading My first paragraph.
Verified working quickstart
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.
Create simple HTML document
index.html contains the documented title, heading, and paragraph.
Decision: Render the local page in a browser.
Create index.html from the W3Schools simple HTML document exampleindex.html contains <title>Page Title</title>, <h1>My First Heading</h1>, and <p>My first paragraph.</p>.
grep documented title, heading, and paragraph in index.html<h1>My First Heading</h1>; <p>My first paragraph.</p>; <title>Page Title</title>
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.
python3 -m http.server 8765 --bind 127.0.0.1Static server listening on http://127.0.0.1:8765/ under timeout supervision.
curl http://127.0.0.1:8765/index.html<!DOCTYPE html> ... <h1>My First Heading</h1> <p>My first paragraph.</p>
agent-browser open, snapshot --json, and screenshot http://127.0.0.1:8765/index.htmlagent-browser DOM snapshot: heading 'My First Heading'; agent-browser screenshot artifacts/w3schools-html-page.png saved.
agent-browser read rendered page# My First Heading My first paragraph.
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.
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
