This example demonstrates an input field that formats numeric values as decimals with a period as the group separator, supporting values up to 999,999. It uses the Inputmask library to apply the decimal masking directly to a DOM element selected via `document.getElementById`. The page consists of a minimal HTML structure with a single input element, initialized by JavaScript that invokes `Inputmask('decimal', ...)` and chains the `.mask()` method to enforce the formatting behavior.