Find if next sibling exist

There is direct message, you can use execute script to create a varaible.

so i created a keyword

  Validate child element exists

it takes two argument parent(Webelement) and child(Xpath) to search for child inside the parent.

  Validate child element exists    ${parent}    ./h3

Assuming parent xpath to as : //ul[@id="top_menu"] , the above code will search for equalent xpath //ul[@id="top_menu"]/./h3 note taht context is parent and not root

so this will be equalent to xpath

*** Test Cases ***
Google Search
    [Tags]    you    probably    do    not    have    this    many    tags    in    real    life
    Wait Until Element Is Visible  CSS=[id="introduction-container"]
    ${parent}=    Get webelement    xpath=//*[@id="introduction-container"]
    ${result}=    Validate child element exists    ${parent}    ./h3   
    Should Be True     ${result}

    
*** Keywords ***
Validate child element exists 
    [Arguments]    ${parent}   ${child} 
    ${child}=    Execute Javascript    return window.document.evaluate( arguments[1], arguments[0], null, XPathResult.FIRST_ORDERED_NODE_TYPE, null ).singleNodeValue;     ARGUMENTS    ${parent}    ${child}
    [Return]    ${child}