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Special characters in permalink not being properly converted #18177

bartczyz opened this issue Oct 30, 2019 · 2 comments


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@bartczyz bartczyz commented Oct 30, 2019

Describe the bug
In Danish there are some extra letters - Ø Å and I've noticed that they are not being properly converted, so:

  • "Ø" should be converted to "OE"
  • "Å" should be converted to "AA"

Initially I thought that this might be an issue with Core, but after doing some tests the characters are converted properly when using Classic Editor:


Since it's not an issue with Core it has to be an issue with Gutenberg. 🤔


In Gutenberg post-permalink component contains a method called onSavePermalink(), that method is using cleanForSlug() helper function that is responsible for performing basic cleanup of a string for use as a post slug.

From what I noticed that function is using lodash.deburr() that deburrs string by converting Latin-1 Supplement and Latin Extended-A letters to basic Latin letters and removing combining diacritical marks, which is causing the whole issue.

To reproduce
Steps to reproduce the behavior:

  1. Go to 'Add New Post'
  2. Put 'Ø Å' in the title and save the post
  3. Click on the saved title to see the slug

Expected behavior
To behave in the same manner as Core.

Additional context

  • I was testing on WordPress 5.2.4 and WordPress 5.3 using Gutenberg 6.7.0.

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@getdave getdave commented Nov 6, 2019

Looks like a good candidate for a PR. Here is the offending function

export function cleanForSlug( string ) {


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@swissspidy swissspidy commented Nov 6, 2019

This is a longstanding and known issue. The main discussing is being tracked in #12907, but it also has been reported in #16695 before. I am therefore closing it as a duplicate.

That doesn't mean it's not a valid report or anything, it just helps us keep a better eye on things.

As for the cleanForSlug function, it already states in the docs that it is somewhat similar to sanitize_title. The only real way would be to replicate the function as-is (some duplicated logic across PHP and JS), or use the REST API (inefficient)

@swissspidy swissspidy closed this Nov 6, 2019
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