When it's time for a monitor to execute, the webpage will be opened first using a simple HTTP request and parsed with Cheerio.
If that initial response does not contain the monitor selection, then the page will be opened in the Google Chrome browser, and Monitoro will wait for it up to 30 seconds to contain the selection.
The monitor will fail loading the page if:
The website is not accessible
The website does not contain the specified selection
Contact support for assistance. We'll be more than happy to help you.