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Accessibility work focuses on making a site parse correctly for assistive technology such as screen readers. Writing descriptive alternative text for images, maintaining sufficient contrast, and using a semantic heading hierarchy are among the most common improvements.

The first step in web performance work is identifying the bottleneck. Browser developer tools expose the timing, size, and blocking behaviour of every request, which makes it possible to target compression, caching, or deferred loading of non-critical scripts instead of guessing.

Stablecoins are crypto assets whose value is designed to track a fiat currency. The most common designs are backed by reserves of short-term government debt or cash equivalents, and issuers publish periodic attestations describing those reserves. For merchants that settle cross-border trade frequently, stablecoins can reduce exposure to exchange-rate swings while keeping the speed and low fees of on-chain transfers.

Double spending is one of the central problems in digital currency design. Without a central clearing authority, the network must find a way to ensure that the same funds cannot be spent twice, which is achieved through consensus rules, timestamps, and the public broadcast of every valid transaction to all participating nodes.

Crypto wallets fall into two broad categories: custodial and non-custodial. A custodial wallet is operated by a service that holds the private keys on the user's behalf, which is convenient but requires trusting that operator. A non-custodial wallet returns control of the keys to the user, which removes counterparty risk but also means that a lost recovery phrase cannot be restored by anyone.