Wash. R. App. P. 10.7
As amended throough October 10, 2024
If a party submits a brief that fails to comply with the requirements of Title 10 and RAP 18.17, the appellate court, on its own initiative or on the motion of a party, may (1) order the brief returned for correction or replacement within a specified time, (2) order the brief stricken from the files with leave to file a new brief within a specified time, or (3) accept the brief. The appellate court will ordinarily impose sanctions on a party or counsel for a party who files a brief that fails to comply with these rules.
Wash. R. App. P. RAP 10.7