How do I make a transparent canvas in html5

Question

How can I make a canvas transparent  I need to because I want to put two canvases on top of one another

User · Answer

Iif you want a particular  lt canvas id  canvasID  gt  to be always transparent you just have to set   canvasID      opacity 0 5      Instead  if you want some particular elements inside the canvas area to be transparent  you have to set transparency when you draw  i e   context fillStyle    rgba 0  0  200  0 5

User · Answer

Paint your two canvases onto a third canvas   I had this same problem and none of the solutions here solved my problem  I had one opaque canvas with another transparent canvas above it  The opaque canvas was completely invisible but the background of the page body was visible  The drawings from the transparent canvas on top were visible while the opaque canvas below it was not

User · Answer

Can t comment the last answer but the fix is relatively easy  Just set the background color of your opaque canvas    canvas1   background-color  black      opaque canvas  canvas2           transparent canvas   I m not sure but it looks like that the background-color is inherited as transparent from the body

User · Answer

Just set the background of the canvas to transparent    canvasID      background transparent

User · Answer

Canvases are transparent by default   Try setting a page background image  and then put a canvas over it  If nothing is drawn on the canvas  you can fully see the page background   Think of a canvas as like painting on a glass plate

User · Answer

I believe you are trying to do exactly what I just tried to do  I want two stacked canvases    the bottom one has a static image and the top one contains animated sprites  Because of the animation  you need to clear the background of the top layer to transparent at the start of rendering every new frame  I finally found the answer  it s not using globalAlpha  and it s not using a rgba   color  The simple  effective answer is   context clearRect 0 0 width height

[html] How do I make a transparent canvas in html5?

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