Sorry if this could already have been answered but I am new to Sharepoint Online.

With previous versions of Sharepoint, this has been working fine for me until now.

  1. Upload an HTML, CSS and JS files within any document repository in Sharepoint
  2. Call the CSS and JS files using traditional src="/RelativePathToTheCSSandJSFiles"

With Sharepoint online, this seems to no longer work. For testing purposes, what I do now is this:

  1. Upload .ASPX file within the default Document folder of a site collection I created
  2. Upload the CSS and JS files within the default Style Library Folder

enter image description here

  1. Called the CSS file using the following script

enter image description here

  1. Called the JS file using the following script

enter image description here

Am I doing this the right way? Please help.

  • Is there a reason to upload .aspx pages in SharePoint that way? What are you trying to do? May 29, 2020 at 13:11
  • Sharepoint Designer is not enabled.
    – Alex M
    May 30, 2020 at 4:45
  • OK, but what are you trying to do? Why are you creating custom aspx pages rather than using SharePoint pages themselves? Do you need to have custom code in there? May 30, 2020 at 13:38
  • Yes. I will be adding custom JS and CSS together with the custom HTML
    – Alex M
    Jun 1, 2020 at 16:19
  • The way to do it is with SPFx, is there a reason to go for aspx pages rather than spfx web parts? Jun 2, 2020 at 13:16

1 Answer 1


Consider using <SharePoint:CssRegistration> content placeholder, which defines the CSS file:

<SharePoint:CssRegistration name="<% $SPUrl:~SiteCollection/Style Library/CSSTest.css%>" runat="server"/>

And at runtime:

<link rel="stylesheet" href="/sites/KnowledgeManagement/Stype%20Library/CSSTest.css" type="text/css" media="all" />


Use CSS to brand SharePoint pages.

SharePoint CSSRegistration or Link?

  • Thanks Chelsea_MSFT. Sorry but I am new to this. Given the structure I have shown above, where do I input the <SharePoint:CssRegistration> code? Can I put that within the ASPX file I created within the Documents folder?
    – Alex M
    Jun 1, 2020 at 16:21
  • 1
    @AlexM If you just want to call the css file within one aspx file, the line you provide in the original post should work as expected. Another reference: sharepoint.stackexchange.com/questions/221030/… Jun 2, 2020 at 6:35
  • Absolute URL to the CSS file worked! Thanks!
    – Alex M
    Jun 4, 2020 at 19:59

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