.is(':visible')
//Selects all elements that are visible.
if($('#Div').is(':visible')){	// add whatever code you want to run here.
}
$('#yourDiv:visible').callYourFunction();

function isVisible(elem) { if (!(elem instanceof Element)) throw Error('DomUtil: elem is not an element.'); const style = getComputedStyle(elem); if (style.display === 'none') return false; if (style.visibility !== 'visible') return false; if (style.opacity < 0.1) return false; if (elem.offsetWidth + elem.offsetHeight + elem.getBoundingClientRect().height + elem.getBoundingClientRect().width === 0) { return false; } const elemCenter = { x: elem.getBoundingClientRect().left + elem.offsetWidth / 2, y: elem.getBoundingClientRect().top + elem.offsetHeight / 2 }; if (elemCenter.x < 0) return false; if (elemCenter.x > (document.documentElement.clientWidth || window.innerWidth)) return false; if (elemCenter.y < 0) return false; if (elemCenter.y > (document.documentElement.clientHeight || window.innerHeight)) return false; let pointContainer = document.elementFromPoint(elemCenter.x, elemCenter.y); do { if (pointContainer === elem) return true; } while (pointContainer = pointContainer.parentNode); return false;
}

if(driver.findElement(By.cssSelector("a > font")).isDisplayed())
{ System.out.println("Element is Visible");
}else{ System.out.println("Element is InVisible"); }