🔰shadows

browser ⟩ canvas ⟩ graphics state ⟩ shadow

⭐️ 重點

Shadows are only drawn if

• shadowColor is set to a non-transparent value.

• One of shadowBlur, shadowOffsetX, or shadowOffsetY must be non-zero.

Shadows are only drawn for source-over compositing operations.

📘 手冊

• CanvasRenderingContext2D ⟩

  • .shadowColor

  • .shadowBlur

  • .shadowOffsetX, .shadowOffsetY

👥 相關

• CSS shadows

• compositing