Web on page 287 of the PHB says (emphasis mine):
You conjure a mass of thick, sticky webbing at a point of your choice
within range. The webs fill a 20-foot cube from that point for the
duration. The webs are difficult terrain and lightly obscure their
area.
As the area is lightly obscured it would seem likely that creatures can see through to the other side. Assuming that the creature can see the target on the other side of the web, do ranged physical or magical attacks pass through an area affected by the Web spell, or does the mass prevent it?
Best Answer
As a general rule...spells do exactly what they say they do, and no more.
In regards to ranged attacks, anything on the other side (or inside) of a Web Spell will be Lightly Obscured.
Lightly Obscured (PHB 183)
This has no impact on ranged attacks.
If the Web could block a ranged attack, the spell would either specify that it grants Cover (PHB 196), or that it Heavily Obscures the area (PHB 183).
Because it does not specify that it creates any of these effects, Web has no impact on ranged attack rolls.