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The default styling of Forms and Element in the Web Client is determined by a default stylesheets stylesheet that can be customized. See Customizing the Web Client for more info.
Servoy allows the style classes of the Servoy elements that have 'styleClass' property to be pushed into the DOM elements.
For this, the webclient setting servoy.webclient.pushClassToHTMLElement needs to be set to true. The styleClass set on the Servoy element will be pushed into the DOM hierarchy, on the first element of the hierarchy corresponding to the Servoy element.
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