How to "unblur" website content under Lightbox?

Question

JavaScript

Hello, I would like to know how you can organize the blurring of content under the LightBox. Are there ready-made libraries that implement this, or how can this be done at least theoretically?

Answer 1

Theoretically, it's possible .
Practically, it's a disaster .
Or other options. I'm not very good at these things. :)

Answer 2

Use canvas and blur on canvas minus lightbox

Answer 3

1) css3 filters, but they do not work in all browsers at all.
2) Canvas