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<html><body><h2>Finding HTML Elements by Query Selector</h2><p class="intro">Hello World!</p><p class="intro">Hello Sweden!</p><p class="intro">Hello Japan!</p><p id="demo"></p><script>const myElements = document.querySelectorAll("p.intro");document.getElementById("demo").innerHTML = "The first paragraph with class='intro' is: " + myElements[0].innerHTML;</script></body></html>