What I am trying to do is:

1. Load the page
2. Gain access to the contents of an external css named "mystyle.css"
3. Check if ".some_class" border has the value "2px"

I have tried

describe('CSS tests', () => {
    it('.some_class border is 2px', async function () {
        await page.goto(<homepageurl>);
        const stylesheet = await page.evaluate(() => {
            return document.querySelector("link[href*='mystyle.css']");
        });
        console.log(current_styles);
        // rest of the code
    });
});

I am getting an empty object {} as a result so I am lost and don't know how to carry on.