Opening local HTML file using Puppeteer

If file is on local, using setContent will be better than goto

var contentHtml = fs.readFileSync('C:/Users/compoundeye/test.html', 'utf8');
await page.setContent(contentHtml);

You can check performance between setContent and goto at here

Let's take a screenshot of an element from a local HTML file as an example

import puppeteer from 'puppeteer';


(async () => {

    const browser = await puppeteer.launch();

    const page = await browser.newPage();
    
    //  __dirname is a global node variable that corresponds to the absolute 
    // path of the folder containing the currently executing file
    await page.goto(`file://${__dirname}/pages/test.html`);

    const element = await page.$('.myElement');

    if (element) {
        await elementHandle.screenshot({
            path: `./out/screenshot.png`,
            omitBackground: true,
        });
    }

    await browser.close();
})();

I just did a test locally (you can see I did this on windows) and puppeteer happily opened my local html file using page.goto and a full file url, and saved it as a pdf:

'use strict';

const puppeteer = require('puppeteer');    
(async() => {    
const browser = await puppeteer.launch();
const page = await browser.newPage();    
await page.goto('file://C:/Users/compoundeye/test.html');    
await page.pdf({
  path: 'test.pdf',
  format: 'A4',
  margin: {
        top: "20px",
        left: "20px",
        right: "20px",
        bottom: "20px"
  }    
});    
await browser.close();    
})();

If you need to use a relative path might want to look at this question about the use of relative file paths: File Uri Scheme and Relative Files