The HTML editor is enabled by default for Header/Footer and HTML blocks, however for certain non-standard HTML and CSS code you may need to disable it in order to prevent it from auto-fixing your code. The option to disable the editor is in the Advanced tab of the header/footer and HTML Block. If Advanced tab is not displayed, you must go to the second screen of the DataPage wizard and enable Advanced Options.
How to disable HTML editor in DataPage Header/Footer and HTML Blocks?
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