Getting all styles with devtool-protocol in puppeteer - google-chrome-devtools

Question

I'm trying to get all styles for all nodes on page and for that i want to use CSS.getMatchedStylesForNode from devtool-protocol, but its only working for one node. If loop through an array of nodes i get a lot of warning in console(code below) and nothing is returned. What i'm doing wrong ?
warning in console:
(node:5724) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 11): Error: Protocol error (CSS.getMatchedStylesForNode): Target closed.
my code
'use strict';
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://example.com');
await page._client.send('DOM.enable');
await page._client.send('CSS.enable');
const doc = await page._client.send('DOM.getDocument');
const nodes = await page._client.send('DOM.querySelectorAll', {
nodeId: doc.root.nodeId,
selector: '*'
});
const styleForSingleNode = await page._client.send('CSS.getMatchedStylesForNode', {nodeId: 3});
const stylesForNodes = nodes.nodeIds.map(async (id) => {
return await page._client.send('CSS.getMatchedStylesForNode', {nodeId: id});
});
console.log(JSON.stringify(stylesForNodes));
console.log(JSON.stringify(styleForSingleNode));
await browser.close();
})();
Puppeteer version: 0.13.0
Platform: Window 10
Node: 8.9.3

Answer 1

Works using for of loop
const stylesForNodes = []
for (id of nodes.nodeIds) {
stylesForNodes.push(await page._client.send('CSS.getMatchedStylesForNode', {nodeId: id}));
}