Apparently neither developers nor site managers know the debugging methods !
Just open the following pages with Internet Explorer (having clicked the check box : Display a notification about every script error in Tools, Internet Options, Advanced) :
- Microsoft Aide et support
- w3schools.com Canvas Element
- HTML5 canvas tutorial
Then some pages becomes almost impossible to read...
To improve the quality of the web, I suggest keeping a « List of Dunces » by extending the previous list.
Thanks in advance.