Some strange problems with the destination-atop attribute of html5 canvas, html5canvas
Recently I found a strange attribute explanation for HTML5 canvas development during Canvas compilation.
The target image is a bitmap displayed on the canvas.
The original image refers to the shape of the image to be executed on the canvas.
This is what w3school said above.
Destination-atopThe target image is displayed at the top of the source image. The part of the target image outside the source image is not displayed.
Then I will explain how to develop HTML5 Canvas.
Destination-atopThe target image is located on the source image. The source image is displayed in the overlapping areas where the two are not transparent. The source image is not transparent while the target image is transparent. The rest are transparent.
Which of the two is authoritative? Which one is correct?
Not much about the demo.
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN "" http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> <Html xmlns =" http://www.w3.org/1999/xhtml "> <Head> <meta http-equiv =" Content-Type "content =" text/html; charset = UTF-8 "/> <title> canvas synthesis </title> <script src =" js/modernizr. js "> </script>Something strange like this.
It seems that the API on w3school is correct.
What is needed in the book?
This proves that sometimes it is not necessarily true -_-//
Then I re-wrote the demo of the merging instance in the book.
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN "" http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> <Html xmlns =" http://www.w3.org/1999/xhtml "> <Head> <meta http-equiv =" Content-Type "content =" text/html; charset = UTF-8 "/> <title> canvas synthesis </title> <script src =" js/modernizr. js "> </script>Finally, I modified HOHO into a demo in the book.
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