Yes, you can use PHP to create the text file with the data you want to import. But as I said before, it must contain only very basic HTML. And no, <html> or <body> tags.
Here is a link with the allowed
Things That Drive Us Nuts
Have you noticed the use of the reCaptcha feature at EE and other web sites? It wants you to read and retype something that looks like this.Insanity! It's not EE's fault - that's just the way reCaptcha works. But it is …
Learn how to create flexible layouts using relative units in CSS. New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).