Sure! Here's an example of how the classic card game "War" can be implemented as a single HTML file using JavaScript:
This code creates a simple web-based version of the game "War" for two players. Each player can tap their respective deck to draw a random card. The value of the card is displayed on top of the deck. After each card is played, the winner of the round is determined based on the card values, and the scores are updated. The game continues until all the cards are gone, at which point the final scores are displayed.
Please note that this is a basic implementation, and it can be extended or customized further based on your requirements.