# WatermarkLine [Integration guide](https://docs.lumencharts.com/charting-library/reference/compatibility) · [Reference index](https://docs.lumencharts.com/charting-library/api/) Public contract reference. This declaration describes types and callback shapes; availability is constrained by the linked integration guide and the runtime capability. Legacy product-specific fields are not a promise of implementation. ## text {#text} ```ts text: string; ``` Use the type signature above and the integration guide for the owning capability. ## fontSize {#fontsize} ```ts fontSize: number; ``` Use the type signature above and the integration guide for the owning capability. ## lineHeight {#lineheight} ```ts lineHeight: number; ``` Use the type signature above and the integration guide for the owning capability. ## vertOffset {#vertoffset} ```ts vertOffset: number; ``` Use the type signature above and the integration guide for the owning capability. --- Documentation page: https://docs.lumencharts.com/charting-library/api/WatermarkLine