How to implement this in SVG?

This is an example of what will be the result : the Sandbox

But the question is : how is it possible to implement cross-browser SVG SVG MASK know about but do not understand how to do it , give me a shove in the right direction.
I carved in the image editor I need a form and posted on the host and used as a transparent background with partial visibility , i.e. the usual frame
All sorts of forms and shapes on SVG do in manual mode but how to make such forms do not know ! Please help me

in General I figured out by yourself : DEFS
July 2nd 19 at 16:59
1 answer
July 2nd 19 at 17:01
I have this link 1000 times viewed and read - it is a pity that a minus or dislike to put here is impossible - Caesar.Keeli commented on July 2nd 19 at 17:04
There for dummies all described + good examples. How do you then docks read.... - Shaina commented on July 2nd 19 at 17:07
: there describe but there is no example to example for #clipping-star - Caesar.Keeli commented on July 2nd 19 at 17:10

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