Explains MIME types—the labels in HTTP Content-Type that tell browsers how to handle files—covering what they are, common examples (HTML, CSS, JS, images, audio, video), why they matter for compatibility, security, and performance, and a practical workflow (e-commerce PDFs) for correct detection and rendering, plus links and book refs.
Practical guide to CSS user-select, the property that controls how text can be highlighted in web UIs. Covers values (none, text, all, element) and when to use them: prevent selection on logos, allow copy on paragraphs, or pair with JS for custom behaviors like row/column or sentence selection. Notes quirks: uneven browser support, Firefox-only effects, wrapping/multiline edge cases, touch issues, and pointer-events/cursor interplay.
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