I am reading this example of server side rendering by React. It states:
Try viewing the page source to ensure that the HTML message is sent from the server (using checksums to determine if client-side rendering is necessary)
Ok, I saw the source of the page and there really is an attribute data-react-checksum:
<div data-reactid=".157rq30hudc" data-react-checksum="556954499">
And when I check the item in the browser console, it also has an attribute:
Then I decided to check out my site, which also uses React server-side rendering. And I see a strange thing. The page source has an attribute data-react-checksum, but the element is not a console.
Page Source:
<div class="activityOptionBox" data-reactid=".1l6uko4wt8g" data-react-checksum="168103090">
Console:
What does it mean? What for checksumand how to read / use it?