For people who wonder if China ever tested DF-21D/26 against sea targets before or just land based stationary targets only, the answer is in this paragraph from the article here.
The important part: North Sea Fleet deputy commander General Liu GengQun who worked for many years at the frontline ships at leadership position, and often as commander to perform various important tasks such as implementation of the nuclear submarine test trials, Liaoning ship sea trials test flight,
land-based mobile strategic missile against sea traget launch and Navy strategic nuclear missiles underwater launch tests and other major tasks.
中新社北京9月3日电 (应妮 黄亮)纪念中国人民抗日战争暨世界反法西斯战争胜利70周年阅兵式3日在北京天安门广场举行。反舰导弹方队由北海舰队某基地官兵组建而成。
受阅的鹰击83K空舰导弹和鹰击12A舰舰导弹,主要担负打击敌大中型水面舰艇及编队任务,是夺取和保持制海权的主要手段,是维护国家主权和海洋权益、构筑现代海上防卫体系的重要装备。
将军领队、北海舰队副司令员刘庚群多年在一线舰艇任职,走上领导岗位后,又经常作为指挥员率舰出海执行重大任务,曾参与执行核潜艇试验试航、辽宁舰海上试验试航试飞、
陆基机动战略导弹对海发射以及海军某战略核导弹水下发射等重大试验任务。由于常年出海,肩周和腿部关节都有劳损,长久站立疼痛难忍,但是,训练中他咬牙坚持,先是站10分钟,然后20分钟,再到半个钟头……经过1个月的集中强化训练,他练就了军姿2小时纹丝不动,40秒不眨眼的硬功夫。
(article posted by lyman2003 of CD)