Hi Victoria,
Thank you for your answer.
I had not noticed the link to download the JavaScript file.
I have copied and pasted the JavaScript code into the Script Editor WebPart.
Here is the result:
An error page like the following is displayed after clicking any breadcrumb link in the WebPart:
Translation of 'Fichier introuvable' : The file has not been found.
Here is the markup of the native link 'Dossier 1':
<a title="Dossier 1" href="/sites/tests/Documents%20partages/Forms/AllItems.aspx?RootFolder=%2Fsites%2Ftests%2FDocuments%20partages%2FDossier%201&View=%7B9D038F77%2D427A%2D4499%2DA47E%2DFDAF7EECB0AB%7D&PageView=Shared&InitialTabId=Ribbon%2EWebPartPage&VisibilityContext=WSSWebPartPage">Dossier 1</a>
Here is the markup of the link 'Dossier 1' in the WebPart:
<a href="https://macsf.sharepoint.com/sites/tests/Documents%20partages/Forms/AllItems.aspx?RootFolder=%2F%2Fsites%2Ftests%2FDocuments%20partages%2FDossier%201&FolderCTID=0x01200074EED2140EA6584FBE02E532D29E8871&View=%7B9D038F77%2D427A%2D4499%2DA47E%2DFDAF7EECB0AB%7D">Dossier 1</a>
What do I have to do to make the links work in the WebPart ?
Thank you in advance for your help