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Hovering over links does not modify page layout.
The objectives of this best practice have not been drafted yet
In order not to perturb page layout, it is recommended that you use the same emphasis mechanism, apart from color for all the different states of a link: normal, visited, hover and active, it is advised for instance not to use bold fonts on hover a text that is not in bold fonts in normal state.
Check that hovering over links does not modify the position of other elements in the page. Check that links do not change size of boldness on hover.