Answer 1

Just doing this should work -

window.open(url, '_blank').focus();

Answer 2

// init urls
let newUrl = 'http://example.com';
let currentUrl = window.location.href;
// open window with url of current page, you will be automatically moved
// by browser to a new opened tab. It will look like your page is reloaded
// and you will stay on same page but with new page opened
window.open(currentUrl , '_blank');
// on your current tab will be opened new url
location.href = newUrl;