Google's "Report a Bug" or "Feedback Tool" lets you select an area of your browser window to create a screenshot that is submitted with your feedback about a bug.   Screenshot by Jason Small, posted in a duplicate question....
Is it possible to capture or print what's displayed in an html canvas as an image or pdf?   I'd like to generate an image via canvas, and be able to generate a png from that image....
I am trying to paint an image on a canvas before I get its dataURL(), but the data returned is like empty.    When I check it in the console, I see there is a lot of A in the string : ("data:image/png;base64,iVBO..some random chars... bQhfoAAAA...
What's the simplest way to add a click event handler to a canvas element that will return the x and y coordinates of the click (relative to the canvas element)?  No legacy browser compatibility required, Safari, Opera and Firefox will do....
I'm trying to create a thumbnail image on the client side using javascript and a canvas element, but when I shrink the image down, it looks terrible.  It looks as if it was downsized in photoshop with the resampling set to 'Nearest Neighbor...
I'm working with a canvas element with a height of 600 to 1000 pixels and a width of several tens or hundreds of thousands of pixels. However, after a certain number of pixels (obviously unknown), the canvas no longer display shapes I draw with...
I'm an experienced Java programmer but am looking at some JavaScript/HTML5 stuff for the first time in about a decade.  I'm completely stumped on what should be the simplest thing ever.  As an example I just wanted to draw something and add...
This question already has answers here:...
Is it possible to query a HTML Canvas object to get the color at a specific location?...
Is it possible to get the RGB value pixel under the mouse? Is there a complete example of this? Here's what I have so far:  <script> function draw() {   var ctx = document.getElementById('canvas').getContext('2d');   var i...

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