TLS Does Three Jobs: Why Renewing Your Certificate Won't Fix Protocol Errors

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SSL is an outdated Netscape protocol from the 1990s that has been fully replaced by TLS, yet many teams still use the term 'SSL certificate' due to legacy vendor terminology. The actual file in use is an X.509 certificate, but the handshake securing the connection runs on TLS, currently versions 1.2 or 1.3. When browsers display security warnings, the root cause is often an outdated TLS version configured on the server — not an expired or invalid certificate. Renewing a certificate does nothing to fix a server still permitting TLS 1.0 or 1.1, which can be verified using OpenSSL command-line checks before making any changes. TLS serves exactly three functions: encrypting data in transit, ensuring integrity against tampering, and authenticating the server's hostname via a CA-signed certificate.

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Strong CSS architecture starts with defining what CSS should never do

A DEV Community article argues that the foundation of robust CSS architecture lies not in defining capabilities, but in declaring explicit exclusions upfront. The author illustrates how design token systems quietly accumulate misuse — such as storing application state inside CSS custom properties — because nothing in the system is built to refuse such decisions. Without predefined boundaries, stylesheets gradually absorb logic and state that belong elsewhere, making systems harder to maintain over time. The piece contends that exclusions are not gaps in architecture but its most durable component, acting as guarantees rather than limitations. A system that never defines what it will not do, the author warns, will eventually be pressured into doing everything.

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ProgrammingDEV Community ·

Good CSS Architecture Requires Defining What CSS Should Never Do

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