Advanced format ruling
Spider Web
Card effect (current official text)If a monster declares an attack, it is changed to Defense Position at the end of the Damage Step. It cannot change its battle position until the End Phase of its controller's next turn, while this card remains on the field.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.