This example uses the supported WiFiManagerPortalConfig presentation API to give the built-in portal a product name, company identity, tagline, inline SVG mark, and semantic colour tokens.

Flash the esp8266 or esp32 environment, join Temperature Monitor, and open http://192.168.4.1/. The visual changes come from static firmware data; WiFiManager still owns the portal routes, forms, validation, and captive-network behaviour.

Use only trusted compiled SVG data. Keep the backing strings static for the lifetime of the firmware, then call setPortalConfig() before opening a portal.

See Portal UI and configuration, architecture boundaries, and the shared example guide.