An intraday drawdown is a loss limit that is watched live, all day, on your account equity. The moment your equity touches the floor, the account breaches. It does not matter whether price recovers a minute later. Closed losses and open floating losses both count, because equity includes both.
This is the strictest form of drawdown. It leaves no room for a trade to dip and come back, so it punishes wide stops, oversized positions, and trading through volatile news events. A spread that widens sharply can push equity below the floor for seconds and still end the account.
The style suits traders who cut losses fast and keep positions small relative to the account. It suits scalpers less than it first appears, because frequent trading means frequent chances to touch the floor.
The common trap is judging a trade by where it closed instead of where it went. A trade that ends in profit still breaches if it dipped below the floor along the way. Check whether your plan measures the limit on balance or equity, and keep your worst-case excursion, not just your planned stop, inside the limit. Prop trading can cost you every fee you pay.