erik2019S
Yes, it's possible to add an HTML5 to a WordPress page without using a plugin or iframe.
First, you need to create your HTML5. Once your file is ready, export it as an HTML5 file. Now,you need to upload your files to your WordPress site. You can do this by logging into your WordPress click on dashboard > Media Library > Add New button to upload your files. When your uploading is done, you need to create a new WordPress page where you want to display the file.
To embed your files you need to add the HTML code to your WordPress page. Open the HTML file in a text editor, copy the code, and paste it into the HTML editor. Once you have added the HTML code for your file, save and publish your WordPress page.