<div id="req8">
<h2>Test #8</h2>
<input id="req8input" type="text" value="Type Number Here">
</div>

String value=""1000000.00""
DecimalFormat myFormatter = new DecimalFormat("###,###.##");
String output = myFormatter.format(value);
WebElement webElement= driver.findElement(By.ById("req8input"));
webElement.sendKeys("100);
assertEquals(output, webElement.getAttribute("value"));

WebElement el = driver.findElement(By.id("req8input"));

el.sendKeys("1000000");

String val = el.getAttribute("value");

assertEquals("$1,000,000.00", val);