What is the XPath expression to find only the first occurrence?

Question

I used this Xpath expression \"//span[@class=\'Big\']\" and got all elements in that page that are under tag and class=\'Big\'

Answer 1

Dimitre Novatchev's answer is correct if you are expecting the class attribute to be equal to Big (without any other classes attached to the element):

(//span[@class="Big"])[1]

... which is similar to the following JavaScript expression:

document.querySelectorAll('span[class="Big"]')[0]

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On the other hand, if you are expecting Big to be one of any number of classes in the class attribute (rather than the only class), you can use the following expression:

(//span[contains(concat(" ", normalize-space(@class), " "), " Big ")])[1]

... which is similar to the following JavaScript expression:

document.querySelectorAll('span.Big')[0]