Pdf.js: Highlight showing over text in IE, but works in Chrome/Firefox

Could you provide link to the PDF document?

This is the link.

https://test.mslacms.com/mslacms/Doc/21207/14_22230000_31049_1_2_55020006_0_0_Capati_R_5502_25071mod.pdf

Thanks for the help,
MSLA-IT

Duplicate of #3900

IE does not implement blending modes. We need to report that to https://connect.microsoft.com

We tried the suggestion in #3900 but it still doesn't work. Should we include something in the compatibility.js as well?

Not sure, as a prototype code snippet shall work in IE.

We got it working.

But we changed a different line of code.

Thanks,
MSLA-IT

Here is voting for implementing this feature in IE:

https://status.modern.ie/compositingandblendingincanvas2d?term=globalCompositeOperation

@msladev, your solution worked perfectly for us until we stumbled upon some PDFs which rendered other image and shape elements with a 50% transparency due to this change.

Example PDF: https://dl.dropboxusercontent.com/u/1652601/ht-1-handbook.pdf

We then moved the workaround to CanvasGraphics_beginAnnotation() and only apply it for IE so it only affects the text highlight and only when it needs to.

Thanks @tbasse, works great.

We had the same issue in our integration of pdf.js. We implemented the workaround of tbasse for internet explorer. Thanks @tbasse
Will this fix or an other implementation find a way into pdf.js? I want to modify the original code as less as possible.
Thx Stefan

@yurydelendik, would you be open to a contribution that implements this workaround? I highly doubt that Microsoft will be addressing this on their end.

This workaround is not acceptable for in the core because we don't want browser-specific hacks in there, but it may be accepted if it can be feature-detected and placed in https://github.com/mozilla/pdf.js/blob/master/src/shared/compatibility.js.

Makes sense, thanks @timvandermeij!

Closing IE11/Edge (non-Chromium-based) issues in response to #11211. Please note that, as outlined in https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#faq-support, only bugs which completely prevent the library and/or the default viewer from running will be accepted.