Turns out Microsoft Edge, unlike Safari, can still open local html files. Discovered in this answer. To wit:

  1. Install Microsoft Edge from the App Store
  2. Open Files (or whatever file browsing app you like).
  3. Open the file, then tap the Share button to send to another app.
  4. Scroll across to "More...", choose Edge, and voila!
Answer from Heath Raftery on Stack Overflow
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Apple Community
discussions.apple.com › thread › 2661059
How to use iPad's Safari to open HTML fil… - Apple Community
November 9, 2022 - No, mobile Safari can't open locally ... are third-party Apps that can do this (such as GoodReader maybe?). You have to transfer the HTML documents to the iPad via the iTunes File Sharing feature....
Discussions

Trying to open a file in Safari on iPad mini - iPhone, iPad, iPod Forums at iMore.com
Okay, Apple folks, I have a question. Very new to iAnything and this is an iPad mini. I have my own html file which is really just a table of links More on forums.imore.com
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August 31, 2022
Trying to open a file in Safari on iPad mini | iMore
Okay, Apple folks, I have a question. Very new to iAnything and this is an iPad mini. I have my own html file which is really just a table of links that I visit frequently. I managed to email it to myself and opened the email and saved the html table (Links.html) to the ipad. When I... More on forums.imore.com
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August 22, 2020
Does anyone know how to open these files on iPhone?
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December 5, 2022
Opening local .html files on iPad - Apple Community
I have created a personal homepage that I have loaded on my Macs at home. Any way I can use this file on my iPad 3? ... It is possible to open local HTML files in Safari on iPad2. More on discussions.apple.com
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May 22, 2016
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Reddit
reddit.com › r/ios › ipad: how do you open a local or network html file in safari (or other browser)?
r/ios on Reddit: iPad: How do you open a local or network HTML file in Safari (or other browser)?
July 14, 2023 -

I have an HTML file in iCloud that I want to open in an iPad browser. I don't see any options in Safari. Is there a URL address bar syntax like "File///"? Browsers are not available in "share" from Apple "Files".

(more info below...)

When I click on the file, the Readdle browser is pre-empting Safari. If I could figure out how to open the file directly from Safari or Brave, my problems would be solved. The Readdle browser doesn't show an "address" for the file when it's opened, so I can't copy it. I can't just delete Readdle without moving a bunch of files around etc. (I used Readdle before "Files" was added.)

I have "a-Shell" installed, but it won't let me access system files.

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iMore
forums.imore.com › ipad-mini-series › 434915-trying-open-file-safari-ipad-mini.html
Trying to open a file in Safari on iPad mini - iPhone, iPad, iPod Forums at iMore.com
August 31, 2022 - I did try entering file:///filepath, as an example, in the Files app and Safari search bar, but no local files appeared. It may be that I just don't have any files at that location, which interestingly, I don't know at the moment what that that may be in iOS; e.g. ~home/username/Documents/. This may help as a data point. I created a Pages blank document and in the document typed in https://www.imore.com In the iPad Files app, the file is saved in the Pages folder in the iPad Files app In the iPad Files app, I opened the document from the folder above Clicked on the URL and then chose "Open Link" which then opened the URL in Safari In the top left hand screen corner, I can click on the Pages back arrow, when then takes me back to the Pages document Thanks for the reply.
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Textasticapp
feedback.textasticapp.com › communities › 1 › topics › 1629-open-local-files-in-safari
Open local files in Safari / Textastic for iOS / Textastic
To open the file in Safari, you would have to upload it to a webserver and enter the URL in Safari. Safari can't access local files that are located in other apps. ... I just worry about the differences between how browsers shows the code, and I'm wondering if I can open local files in other ...
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Apple iPad Forum
ipadforums.net › ipad forums › ipad general discussions
How to open an Internet Shortcut File (.URL) in Safari on iPad | Apple iPad Forum
April 8, 2014 - I already had the feeling that it would be difficult to get these shortcuts started directly on the iPad (they do work on an iMac, though). But it would be good if I had a chance to access them directly without doing any extra transformation work on the iPad. But I found out a three-step method: I can copy the url file into my dropbox, save it there and can then open it in Safari.
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iMore
forums.imore.com › home › apple hardware › ipad › ipad mini series
Trying to open a file in Safari on iPad mini | iMore
August 22, 2020 - I did try entering file:///filepath, as an example, in the Files app and Safari search bar, but no local files appeared. It may be that I just don't have any files at that location, which interestingly, I don't know at the moment what that that may be in iOS; e.g. ~home/username/Documents/. This may help as a data point. I created a Pages blank document and in the document typed in https://www.imore.com In the iPad Files app, the file is saved in the Pages folder in the iPad Files app In the iPad Files app, I opened the document from the folder above Clicked on the URL and then chose "Open Link" which then opened the URL in Safari In the top left hand screen corner, I can click on the Pages back arrow, when then takes me back to the Pages document
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How To Reset Boult Airpods
ifon.ca › how-to-open-html-file-in-safari-on-ipad.html
How To Open Html File In Safari On Ipad?
March 7, 2025 - This way you can start safari and then view the content of the selected page. Also, double-clicking starts a program other than safari, right click on the HTML file of your interest and select the elements Open with> Safari from the context menu. Correspondingly, can you use HTML on iPad?
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Stack Overflow
stackoverflow.com › questions › 17040810 › how-do-i-preview-a-file-in-safari-on-ipad
How do I preview a file in safari on iPad?
Therefore, the only way to solve this would be to use a proxy server that you can control, where your javascript app talks to your proxy server, your proxy server gets the file for your app, then sends it to your app without the offending headers ...
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Apple Community
discussions.apple.com › thread › 254680550
How to read PDF on Safari on iPad - Apple Community
March 2, 2023 - Browse the web using Safari on iPad – Apple Support ... To download a file, touch and hold the file or link you want to download, then tap Download Linked File.
Top answer
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That option is located in the Safari Preferences dialog.

in Safari go to the Safari menu and select Preferences.

If it is not already selected click on the General icon in the top left of the Preferences dialog.

At the very bottom there should be a checkbox (likely unchecked) that says "Open "safe" files after downloading." Check that box and you should be good to go.

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There are several aspects to the behavior you are describing. First, you should know that the "Open" vs "Save" behavior is not strictly controlled by the Operating System; it is a function of the application and the source of the file. For example, you mentioned GMail... there are many different ways to configure GMail, but in my setup, hovering the pointer over a mail attachment yields a choice of Save to Drive (i.e. Google Drive), or Download. In the Chrome browser's Settings, Advanced menu, you will find options to specify both the download location, and whether or not the file will be opened after download. You'll find similar settings for Firefox, and for Safari (as pointed out in @SteveChambers answer).

Also, as @jmh pointed out in his comment, a "right click"/control click will yield a context-sensitive menu that may offer choices such as Open and Save As..., depending upon the type of document it is, and how the web page was coded.

It seems that you may be laboring under a misconception. By that, I mean you seem to feel that Microsoft is not saving the file before you open it. Let me assure you that Microsoft is saving the file before you open it. Microsoft may be saving the file to a temporary location (I'll explain that in a moment), but they are saving it - that is, it exists on your hard drive somewhere, and it was downloaded.

And so, if you wish to "do it like Microsoft does" on your Mac, you might try this:

  1. If you're using Safari as your web browser, you can configure it as outlined in @SteveChambers answer; i.e. open the file after download. Likewise, these same settings are available in Chrome and in Firefox (and likely any other browser you'll encounter).

  2. You can change the default location for Downloads . Generally all the browsers (Firefox, Chrome, Safari) default saving downloaded files to the folder ~/Downloads - a folder you will see in your Dock. Files you download to this folder will remain there until you manually delete them. However, if you specify /tmp (a "temporary" folder) as the default location for downloaded files, these downloads will be deleted when your system restarts.

One caveat you should be aware of: If you elect to use /tmp, you should NOT go into /tmp and manually delete files. Let the OS take care of the cleanup.

Hope this helps... transitioning to a new OS means re-learning some things, but at the end of the day, they often do the same things, but called by a different name. Such is the case with "Open" and "Download".

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Apple Community
discussions.apple.com › thread › 252382213
Safari Open File-Open File list view - Apple Community
January 29, 2021 - Can't open downloaded files on Safari Hi, I am unable to open downloaded file's in Safari from the downloads icon. It comes up with - Safari can't open the file - because no available application can open it. I can however go to finder - downloads - click on the file and it will open in it's app.
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Apple Community
discussions.apple.com › thread › 255549790
How can I open local HTML files on my iPh… - Apple Community
March 30, 2024 - Instead, you can save the websites to your Reading List. To enable offline reading of items in the list, go to Settings > Safari, then turn on Automatically Save Offline (below Reading List).
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Stack Overflow
stackoverflow.com › questions › 73012249 › how-do-i-open-a-file-link-in-safari-on-ios-using-swift
How do I open a "file:///" link in "Safari" on "iOS" using "Swift"? - Stack Overflow
The file is likely sandboxed and not accessible. Depending what it is, you could always run a local web server in your app which Safari can access. ... This question is in a collective: a subcommunity defined by tags with relevant content and experts. ... I’m Jody, the Chief Product and Technology Officer at Stack Overflow. Let’s... ... Does the (non alphabetical) authorship position of a paper reflect the responsibilities towards the paper itself?