Compound class names are not supported. Consider searching for one class name and filtering the results

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I am using driver.findelement by.classname method to read an element on firefox browser but i am getting “Compound class names are not supported. Consider searching for one class name and filtering the results.” exception

here is my code

driver.FindElement(By.ClassName("bighead crb")).Text.Trim().ToString()
//and here is how the html of browser looks like
<form action="#" id="aspnetForm" onsubmit="return false;">
<section id="lx-home" style="margin-bottom:50px;">
<div class="bigbanner">
<div class="splash mc">
<div class="bighead crb">LEAD DELIVERY MADE EASY</div>
</div>
</div>
</section>
</form>
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No, your own answer isn’t the best one in terms of your question.

Imagine you have HTML like this:

<div class="bighead ght">LEAD DELIVERY MADE HARD</div>
<div class="bighead crb">LEAD DELIVERY MADE EASY</div>

driver.FindElement(By.ClassName("bighead")) will find both and return you the first div, instead of the one your want. What you really want is something like driver.FindElement(By.ClassName("bighead crb")), but like you said in your question, this won’t work as you need another way to find elements by compound class names.

This why most people use more powerful By.CssSelector or By.XPath. Then you have:

CssSelector (the best):

driver.FindElement(By.CssSelector(".bighead.crb")); // flexible, match "bighead small crb", "bighead crb", "crb bighead", etc.
driver
.FindElement(By.CssSelector("[class*='bighead crb']")); // order matters, match class contains "bighead crb"
driver
.FindElement(By.CssSelector("[class='bighead crb']")); // match "bighead crb" strictly

XPath (the better):

driver.FindElement(By.XPath(".//*[contains(@class, 'bighead') and contains(@class, 'crb')]")); // flexible, match "bighead small crb", "bighead crb", "crb bighead", etc.
driver
.FindElement(By.XPath(".//*[contains(@class, 'bighead crb')]")); // order matters, match class contains string "bighead crb" only
driver
.FindElement(By.XPath(".//*[@class='bighead crb']")); // match class with string "bighead crb" strictly
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