Type a report, a lab protocol or a course handout, and set it in styles you edit yourself: title, headings, captions, quotes, tables, or styles of your own. Every style is CSS, kept in the document, so the page looks the same in any browser.
Insert a structure drawn on draw.cheminfo.org, a 3D model, orbitals, a TLC plate, an apparatus or a periodic table, or paste one copied from those sites. Double-click a figure to change it again on the site that drew it. The document is saved as one HTML file holding the text, the figures as SVG and the style sheet.
Write a report in styles you edit, insert structures, 3D models, TLC plates and apparatus from the sites of cheminfo, and save one HTML file holding the text, the figures and the style sheet. The editor needs JavaScript, because the document is written in your browser.