HTML content can be used in reports only for text-formatting. The supported HTML tags and CSS attributes are listed in the HtmlTextBox overview
article. Not supported HTML tags and CSS attributes will not be displayed.
An approach to render the HTML as an image, which can be used in reports via PictureBox item, is elaborated by my colleague in this forum post
On a side note, Telerik UI for AJAX and Telerik Kendo UI provide libraries for exporting HTML in other formats. For more details, please check ClientExportManager.
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