JavascriptExecutor methods

((JavascriptExecutor) driver).executeScript("arguments[0].scrollIntoView(true);", 

 webElement);

((JavascriptExecutor) driver)
.executeScript("arguments[0].setAttribute('style', 'color: yellow; border: 2px solid yellow;
');", element); 

((JavascriptExecutor) driver).executeScript("arguments[0].click;", 
 webElement);

check image has loaded

List<WebElement> allImages = driver.findElements(By.tagName("img"));
for (WebElement image : allImages) {
  boolean loaded = ((JavaScriptExecutor) driver).executeScript(
      "return arguments[0].complete", image);
  if (!loaded) {
    // Your error handling here.
  }
}