Toolk Blog

Practical Guides for JSON, CSS, Markdown and Data Conversion

Learn format rules, compare conversion methods, and troubleshoot common errors with worked examples and links to the relevant browser tools.

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px vs em vs rem in CSS: Sizing Rules and Examples

Compare CSS pixels, element-relative em, and root-relative rem. Understand nested sizing, font preferences, browser zoom, and conversion assumptions.

Compare CSS color formats, conversion rules, gamut limits, and interpolation. Choose a notation for editing colors and check contrast separately.