java - unable to locate href element within a mouse over area - Selenium web driver -

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i tried locate link "sign in" located in window appeared when mouse move on "mail" link on yahoo. can xpath using firebug. when used in script, doesn't work.

enter image description here

html snippet :

<a id="yui_3_18_0_4_1456816269995_943" class="c($menulink) fw(b) td(n)"      data-ylk="t3:usr;elm:btn;elmt:lgn;" data-action-outcome="lgn"      href="login.yahoo.com/config/…; data-rapid_p="23">sign in</a>

i tried in code within main method, 

    webelement element = driver.findelement(by.id("uh-mail-link"));     actions action = new actions(driver);     action.movetoelement(element).build().perform();     driver.findelement(by.id("yui_3_18_0_4_1456804882382_929")).click();

id selecter;

driver.findelement(by.id("yui_3_18_0_4_1456804882382_929")).click();

it prompts error;

exception in thread "main" org.openqa.selenium.nosuchelementexception: unable locate element: {"method":"id","selector":"yui_3_18_0_4_1456804882382_929"} command duration or timeout: 17 milliseconds

can locate using id of appeared window ".//*[@id='yui_3_18_0_4_1456804882382_919']" , linktext "sign in", or there other methods locate in script.

you're supposed pass id by.id(), not xpath expression :

driver.findelement(by.id("yui_3_18_0_4_1456804882382_929")).click();

or use by.xpath() instead of by.id() if need find element xpath expression, example, using combination of id , link text locate target element.

update :

you can filter element text content , id :

//a[@id='yui_3_18_0_4_1456816269995_943' , .='sign in']

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