How to hide a phone number?

Question

css

How to hide phone?
the same as in Avito.

Answer 1

in my opinion, you can’t do without the server part (php for example)
the php script renders an image from the text, and with ajax you pull it onto the page

Answer 2

Add a "Show phone" button to the page, when clicked on it, JavaScript will show a picture with a phone number.
Surely, there are spambots that can recognize text from images. So you can look at other ways to protect information from spambots: habrahabr.ru/post/22549

Answer 3

For the block with the phone, set display:none, when you click on the "show" button, set display:block (for example)