When handwriting 黄 (huáng; yellow) is it incorrect to have a disconnected 草 (cǎo; grass) radical on top?
Neither the PRC form「黄」nor the ROC/HK form「黃」contains「艸・艹」. The top of the PRC form「黄」is written as「龷」.



商甲甲806合集32509商甲京津636　西周金耳尊集成6007

「黃」originally depicted a person「大」with a swollen chest/abdomen as a kind of deformity/sickness, indicating the meaning weak, feeble; a mouth「口」was added to the top later, emphasising the person sighing in distress. The word that「黃」originally represented is now written as「尪」.

The modern descendant shapes from the above are:


ROC/HK form:

東周・秦石鼓汧殹　今楷・臺標　今楷・港標　
PRC form:

秦簡睡・秦34　東漢隸張遷碑　今楷・陸標　


As can be seen, there was never a「艸・艹」component in the character.