Open HTML files in browser - SharePoint Online

Here's the document that addresses the issue:
https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/security-permissivesetting

Only Microsoft could make it so insanely complicated that there are 3 pages of technical answers here, spread over six years, and still no easily applicable solution. And the problem we are having is effectively: how to view files that were intended for the internet, *on the internet*, in this internet-based office system?!

Does the "365" stand for how many degrees of unnecessary complexity there are?

Melissa Klug I have done this. I uploaded the html files to  a document library.

Then I used sharepoint designer to access this document library and renamed all the html extension to aspx. If there is references with some html files to other html files sharepointdesigner will rename these references when changing the file extension to aspx. In fact, I uploaded an entire html site to document library, about 160 pages and had it working within sharepoint in 20 minutes.

Hello Melissa Klug,

I know this thread is a little bit older, but I stumbled over this while looking for a solution for the same issue. With several try and errors, I finally got a solution that might help you.

What you will need, is a tenant admin and a bit of PowerShell code. So let me describe the few steps necessary:

1) Login to your SharePoint Tenant via SharePoint Online Management Shell with 

Connect-SPOService

2) Execute 

Set-SPOSite -Identity https://[yourtenant].sharepoint.com/[siteurl] -DenyAddAndCustomizePages 0

After this execution, you will get the Content Editor WebPart available in the WebPart Section and you will be able to include your HTML page inside a Default aspx page of SharePoint.

While I was still experiencing the Problem, that I cannot navigate to a html page inside a library, I was able to create a folder on the root of the site when connecting via SharePoint Designer. After placing a html file here, I was able to navigate to it. Since I did some try and error in advance, you may need to enable the publishing feature too, but I cannot tell if this is really necessary.

Cheers, Tim

-- Updated... now with Format 

Melissa Klug   I've just joined to look for a solution to exactly the same problem. 

i've had a small win using File Viewer to show a html5 page. 

I uploaded the html file that i wanted to show into a Documents folder, and then set up a new site page with a File Viewer web part.  When the page is published, the html file opens fine in the File Viewer window.  The hyperlinks (to external links) in the html page are active and seem to pop out and open up with a normal browser.  I haven't tried it yet to open another html file in the same doc folder though.

Melissa Klug Try to give some more permission like adding to Owners group or site collection admin. This solved my problem. Thanks

 

For those of us who are still onpremise.
Add the html mime type to the WebApplication in SharePoint and use a document library in classic mode. Not sure if Microsoft let's you do this in SharePoint Online.

You can use the script to add any mime type.

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

$webApp = https://yoursitename.com

function Add-SPAllowedInlineDownloadedMimeType{

[CmdLetBinding()]

param(

[Parameter(Mandatory=$true, Position=0, ValueFromPipeLine=$true)]

[Microsoft.SharePoint.PowerShell.SPWebApplicationPipeBind]$WebApplication,

[Parameter(Mandatory=$true, Position=1)]

[string]$MimeType

)

process{

$actualWebApp = $WebApplication.Read()

if ($actualWebApp.AllowedInlineDownloadedMimeTypes -notcontains $mimetype)

{

Write-Host "Adding MIME Type..."

$actualWebApp.AllowedInlineDownloadedMimeTypes.Add($mimetype)

$actualWebApp.Update()

Write-Host "Done."

} Else {

Write-Host -ForegroundColor Green "MIME type is already added."

}

}

}

Add-SPAllowedInlineDownloadedMimeType -WebApplication $webApp -MimeType "text/html"

Melissa Klug

Hello - I also had this issue and the workaround I came up with is uploading all html assets with the index.html to a document library, then opening the file library contents in "Open with Explorer" mode on SharePoint, open the index.html from here and you will notice a different address in the address bar, use this link instead and it will work! Melissa Klug 

My solution was to modify the img src in each html file, pointing it to the complete url path (https://company.sharepoint...../image1.png).

When you open the html file with the sharepoint's viewer, you have to allow use of 3rd party cookies if you're using Chrome (I had no trouble in Edge).

Cheers!