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Rich text font / size behaviour in the Knowledge Article Editor

Knowledge Article Number 000240384
Description When using Rich-text field on the Knowledge Article Editor you can see the following behavior:

If you set the font size of the text in the editor it displays the correct formatting, but once you highlight the same text and click on the same font size  the highlighted text format is changing.
Resolution The first time you select a font size, it adds the <span style="font-size:12px;"> tag around the selected text (as an example font size: Arial 12). You can check it in the browser's developer console. 

User-added image

If you select the same text and select the same font size again, it removes the span tag, the text is going back to the original size, before the first formatting:

User-added image

This is working as designed.

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