If the content you entered in the WYSIWYG editor is not displayed properly on the storefront, make sure that the HTML content is not copied and pasted from another text editor (e.g. Microsoft Word).
Microsoft Word tends to insert hidden code into a text. When pasted into a web page using the WYSIWYG editor, this hidden code can mess up the layout and cause web browsers to crash and/or display an error.
To avoid it, create the necessary content directly in the WYSIWYG editor that is integrated in the marketplace.
If you have a considerable amount of text written in Microsoft Word, copy the text and paste it into Notepad: that will remove all the unwanted code from the text. Then you can copy the text from Notepad and paste it into the WYSIWYG editor. This will provide a clean copy of the text that can be formatted properly within marketplace.