Please tell me about this blocks... 
Where you found these blocks?
I have seen the top one. but not the others.
But if we translate these words, we'll understand what they create.
Where did you find them?
This blocks are from the Snap! 5.0.0, but please tell me about this 3 blocks.
This developer blocks are from the Snap! 5.0.0, but I don't have answer for this. 
where can i get the 5.0 version?
Have you tried testing them to see what they do?
I think they might just be test blocks.
Because of antialiasing of the browser canvas edge of the drawing are difussed with other colors.
Tolerance means that block checks not only exact but also slightly simlar colors.
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