A field guide from PageKit
Check the colors people actually see
Contrast depends on the foreground and background together. A dark text color can pass on white and fail on a colored card. PageKit calculates the ratio for opaque sRGB colors and shows the common text thresholds. It does not account for translucent layers, background images, focus indicators, or every requirement for accessibility. Check each real combination in the final interface.
Separate color notation from color appearance
Hex, RGB, and HSL are different ways to express an sRGB color. Converting between them does not change the intended color or automatically improve its contrast. HSL is useful for exploring hue, saturation, and lightness, but equal lightness values do not guarantee equal perceived brightness. Test readability after changing a color instead of relying only on a color coordinate.
Inspect a link without following it
The URL inspector parses a provided address locally. It shows the host, path, protocol, port, and query values without making a request to that host. Parsing does not certify ownership or safety. Check the hostname carefully, especially before entering credentials, and remember that a familiar word in a path does not establish that the domain belongs to a familiar organization.
Use random text within its limits
The password generator uses cryptographic browser randomness with unbiased character selection. The modeled entropy assumes independent random characters; it is not a diagnosis of a device or a guarantee of account security. Store passwords appropriately and avoid reuse. Similarly, an aspect-ratio result gives dimensions, but image quality, cropping, and file size still require separate decisions.