HTML and CSS are commonly used in Power BI and Tableau to create custom visualizations and to customize the appearance of the data visualization.

In Power BI and Tableau, HTML and CSS can be used to create custom visualizations and to customize the appearance of the data visualization, such as adding custom logos, background images, and customizing the layout.

Additionally, Power BI and Tableau can import and use custom visualizations built in JavaScript and other web technologies, which requires a basic understanding of web development concepts like HTML, CSS and JavaScript.

All these will not usually be covered in other training institutions.

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