543x.com - adding line numbering and text indentation

copying text, clearing text, toggling between dark and light modes, and adding line numbering and text indentation:

Handling the Tab key to insert indentation in the text area.

This implementation provides a simple and user-friendly interface for basic text manipulation, including line numbering, text indentation, and dark/light mode toggling.

BTC Bitcoin: A Peer-to-Peer Electronic Cash System

USDT USD-pegged stablecoin for blockchain transactions

A Inspired by "The Scream", it combines loneliness, despair, exploration spirit and community power, aiming to become a unique existence in the cryptocurrency field, bringing emotional resonance and value to investors and holders

MIMI Sweet and cute, fashionable and changeable, stable and reliable, by integrating these qualities, mimi aims to become a highly personalized and attractive presence in the cryptocurrency field.

SHEEP A cryptocurrency platform with a herd spirit at its core, solidarity, collaboration, stability, reliability, adaptability and harmony

SNAKE Inspired by the snake's flexibility, stealth, alertness, metamorphosis, evolution and global interconnection, we aim to become a trusted global cryptocurrency brand through continuous technological innovation and global cooperation.

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