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puppetbox

Capture screenshots of HTML using Chrome's headless mode.

Requirements

• for node version, see package.json

Why puppetbox?

• Its code base is tiny and maintainable.
• It's framework-agnostic. All that is needed to get started is a HTML string.

Installation

$ npm i -D puppetbox

Usage

puppetbox allows you to capture screenshots using headless Chrome by entering a HTML string. For visual regression testing, a screenshot could later be compared using looks-same.

import { capture, htmlEnvelope } from "puppetbox";
import { writeFileSync } from "fs";

(async () => {
  const input = htmlEnvelope("<p>hello world</p>");

  const screenshot = await capture(input, {
    height: 100,
    width: 100
  });
  writeFileSync(`example.png`, screenshot)
})();

screenshot of "example.png" below:

Notes

• Headless Chrome renders an HTML string that is a valid and minimal HTML document differently than passing in an HTML fragment. Compare "hello world" as an HTML fragment and "hello world" embedded into a valid HTML document. We recommend consistant usage of embedding or using fragments. A utility function for embedding a HTML fragment into a minimal HTML boilerplate is provided with the htmlEnvelope function.

Changelog

0.1.0

Stop embedding fragments in HTML doc.

• Stop exporting capture as default
• Export htmlEnvelope function
• Add tests for capture and htmlEnvelope functions
• Add Note about how headless Chrome renders fragments differently from documents

0.0.1

• Release initial version

License

See License.