Edge changes case of URL in Top Sites

Won’t fix Issue #17250991


David B.
Apr 27, 2018
This issue is public.
Found in
  • Microsoft Edge
Found in build #
Reported by 5 people

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Steps to reproduce

If I create a top site in EDGE using the URL
all the upper case characters are converted to lower case and the URL no longer works


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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Steven K.”

    • Hi David,

      I want to make sure I understand the issue you are reporting.  You created a website that is based on the site you mentioned and in the new site (your site) the links are not working?

      It would simplify my investigation if you provide a simplified version/repro of the issue you are seeing and uploading it here.  I do not have enough information to see what is happening.

      Also, will you provide the extended version of Windows 10 you are using?  Win + S and type “winver” and hit enter.

      Thank you,


    • Hi

      I obviously did not explain clearly. I am accessing a tide-time website and just want to use the edge new tab / top site facility to create an icon that will take me there.
      The problem is that the URL is

      if I put this into a new topsite icon (the box with a + on it) it gets converted (all upper case change to lower) to
      http://www.ukho.gov.uk/easytide/easytide/showprediction.aspx?portid=0036a&predictionlength=7 and no longer works.

      Winver shows Version 2709 (OS Build 16299.371)
      Microsoft Edge 41.16299.371.0
      Microsoft EdgeHTML 16.16299

      Dave Barratt

    • Hi David,

      That makes sense.  Thank you for clarifying.  I was able to reproduce this issue.  Interesting discovery.  :)

      Appreciate the support,


    • Microsoft Edge Team

      Changed Assigned To to “Scott L.”

      Changed Assigned To to “David R.”

    • Same problem with the Australian BOM site (weather radar)
      URL for Sydney is:
      With idr in lower case, message received is: The page you requested was not found on this server

    • Microsoft Edge Team

      Changed Assigned To to “Jeremy T.”

      Changed Assigned To from “Jeremy T.” to “Ravi D.”

      Changed Assigned To from “Ravi D.” to “Ray R.”

      Changed Status to “Confirmed”

      Changed Assigned To from “Ray R.” to “Puneet P.”

      Changed Assigned To from “Puneet P.” to “Ray R.”

      Changed Status from “Confirmed” to “Won’t fix”

    • Any reason for the Won’t Fix? This is rather annoying with applications like Jira.

    • It’s worth noting that https://www.w3.org/TR/WD-html40-970708/htmlweb.html indicates: "URLs in general are case-sensitive". And while https://tools.ietf.org/html/rfc1738 is not specific on case, it is very specific about case-insensitivity in the scheme, implying that case-sensitivity is default and should therefore apply to the scheme-specific-part.

    • my browser currently says “Microsoft Edge 44.18932.1000.0” under settings.

      I also have encountered this issue, and it’s very frustrating to see that the issue is Known AND marked as Won’t Fix !!

      I was trying to create a link to a specific YouTube channel’s list of videos, sorted by date, that I am currently watching through: https://www.youtube.com/channel/UC7sDT8jZ76VLV1u__krUutA/videos?view=0&sort=da&flow=grid

      it’s very nice that I can just type “dust” (the channel name) and that link will appear as a recently / often visited site, right on top of the list from my address bar. however, when I tried to add it as a quick button on my Top Sites browser home page list, it changed the link: https://www.youtube.com/channel/uc7sdt8jz76vlv1u__kruuta/videos?view=0&sort=da&flow=grid

      I was very confused as to why this channel suddenly “did not exist” according to YouTube, then I revisited the page from the address bar and it was back. I thought it was just a temporary outage, but I soon noticed it was because the URL is Case Sen-Si-Tive.

      the letter u is not the letter U. I can quickly run a wonderful MS tool by pressing Win+R and entering “charmap” to see that Latin Capital Letter U is encoded as U+0055 and Latin Small Letter U is U+0075.

      why on earth would any browser not differentiate between cases? if this is considered Won’t Fix", then I consider Microsoft Edge to be "Indefinitely Intentionally Left Broken". you are not a small business who can’t afford the time to fix every bug. this is a functionality breaking mistake that needs to be resolved. anything else is totally unprofessional and unreasonable from a company like Microsoft.

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