Почему некоторые скрипты не работают в Opera, Google Chrome?

//Scroll to Top button 
 
var scrollToTopButton = document.querySelector('.up-scroll'); 
 
if(window.addEventListener) { 
	window.addEventListener('scroll', topScrollButtonViev); 
} else { 
	window.attachEvent('onscroll', topScrollButtonViev); 
} 
 
function topScrollButtonViev(event) { 
	event = event || window.event; 
	if (event.pageY >= 300) { 
		scrollToTopButton.classList.remove('up-scroll_unviev'); 
	} else { 
		scrollToTopButton.classList.add('up-scroll_unviev'); 
	} 
} 
 
if(scrollToTopButton.addEventListener) { 
	scrollToTopButton.addEventListener('click', topScroll); 
} else { 
	scrollToTopButton.attachEvent('onclick', topScroll); 
} 
 
function topScroll() { 
var topInterval = setInterval(topScrollUpSteps, 10); 
	function topScrollUpSteps () { 
		if (window.pageYOffset >= 1) { 
			window.scrollBy(0, -80); 
			console.log(window.pageYOffset); 
		} else { 
			clearInterval(topInterval); 
		} 
	} 
}

//Swimming header 
 
if(window.addEventListener) { 
	window.addEventListener('scroll', swimHeader); 
} else { 
	window.attachEvent('onscroll', swimHeader); 
} 
 
function swimHeader(event) { 
	event = event || window.event; 
	var header = document.querySelector('header'); 
	var headerStyle = header.style; 
	var neibourElement = document.querySelector('.your_invetnory'); 
	if (event.pageY >= 100) { 
		headerStyle.position = 'fixed'; 
		headerStyle.top = '0'; 
		headerStyle.left = '0'; 
		headerStyle.width = '100%'; 
		headerStyle.zIndex = '1000'; 
		headerStyle.animation = 'headerOpacity 1s 1 ease'; 
		neibourElement.style.paddingTop = '78px'; 
	} else { 
		headerStyle.position = 'static'; 
		neibourElement.style.paddingTop = '0'; 
		headerStyle.animation = '0'; 
	} 
}

// Drop-down language 
 
var dropDownLanguage = document.querySelectorAll('.drop-down_language'); 
for(var i = 0; i<dropDownLanguage.length; i++) { 
	if(dropDownLanguage[i].addEventListener) { 
		dropDownLanguage[i].addEventListener('click', OpenDropDownLanguage); 
	} else { 
		dropDownLanguage[i].attachEvent('onclick', OpenDropDownLanguage); 
	} 
} 
 
function OpenDropDownLanguage() { 
	var hiddenDropDown = document.querySelectorAll('.hidden_drop-down_language'); 
	for(var i = 0; i<hiddenDropDown.length; i++) { 
		if (hiddenDropDown[i].style.display == '' || hiddenDropDown[i].style.display == 'none') { 
			hiddenDropDown[i].style.display = 'block'; 
			dropDownLanguage[i].classList.add('drop-down_language_change_arrow'); 
		} else { 
			hiddenDropDown[i].style.display = 'none'; 
			dropDownLanguage[i].classList.remove('drop-down_language_change_arrow'); 
		}; 
	} 
};

// Icon copy code 
 
var copyCodeIcons = document.querySelectorAll('.promocode_row i'); 
for(var i = 0; i<copyCodeIcons.length; i++) { 
	if(copyCodeIcons[i].addEventListener) { 
		copyCodeIcons[i].addEventListener('click', copyCode); 
	} else { 
		copyCodeIcons[i].attachEvent('onclick', copyCode); 
	} 
} 
function copyCode(event) { 
	event = event || window.event; 
	console.log(event.target); 
	if (event.target.tagName == 'I') { 
		 var copyText = event.target.parentNode.firstElementChild.textContent; 
	} 
	var textInput = document.createElement('input'); 
	document.body.append(textInput); 
	textInput.value = copyText; 
	textInput.select(); 
	document.execCommand("copy"); 
	textInput.remove(); 
	var successfulMessage = document.createElement('div'); 
	successfulMessage.innerHTML = '<p>Код скопирован в буфер обмена</p>'; 
	successfulMessage.classList.add('successful_copy_code'); 
	var successfullContainer = document.querySelector('.successful_messages_container'); 
	successfullContainer.append(successfulMessage); 
	var successfulMessageOppacityAnimation = setInterval(closeSuccessfulMessage, 40); 
	var opacityCount = 100; 
	function closeSuccessfulMessage() { 
		successfulMessage.style.opacity = opacityCount/100; 
		opacityCount --; 
		if (opacityCount<=10) { 
			clearInterval(successfulMessageOppacityAnimation); 
			successfulMessage.remove(); 
		}; 
	}; 
};

// Site Category Changer 
 
var classic = document.getElementById('classic-game'); 
var cases = document.getElementById('case-game'); 
var double = document.getElementById('double-game'); 
var crash = document.getElementById('crash-game'); 
var craft = document.getElementById('craft-game'); 
 
if(classic.addEventListener) { 
	classic.addEventListener('click', function() { 
		categoryChanger('classic'); 
	}); 
} else { 
	classic.attachEvent('onclick', function() { 
		categoryChanger('classic'); 
	}); 
}; 
 
if(cases.addEventListener) { 
	cases.addEventListener('click', function() { 
		categoryChanger('case'); 
	}); 
} else { 
	cases.attachEvent('onclick', function() { 
		categoryChanger('case'); 
	}); 
}; 
 
if(double.addEventListener) { 
	double.addEventListener('click', function() { 
		categoryChanger('double'); 
	}); 
} else { 
	double.attachEvent('onclick', function() { 
		categoryChanger('double'); 
	}); 
}; 
 
if(crash.addEventListener) { 
	crash.addEventListener('click', function() { 
		categoryChanger('crash'); 
	}); 
} else { 
	crash.attachEvent('onclick', function() { 
		categoryChanger('crash'); 
	}); 
}; 
 
if(craft.addEventListener) { 
	craft.addEventListener('click', function() { 
		categoryChanger('craft'); 
	}); 
} else { 
	craft.attachEvent('onclick', function() { 
		categoryChanger('craft'); 
	}); 
}; 
 
function categoryChanger(categoryName) { 
	var siteList = document.querySelectorAll('.site_box'); 
	for (var i = 0; i < siteList.length; i++) { 
		siteList[i].style.display = 'none'; 
	}; 
	for (var i = 0; i < siteList.length; i++) { 
		categoryAttribute = siteList[i].getAttribute('data-category'); 
		if (categoryAttribute.indexOf(categoryName) > -1) { 
			siteList[i].style.display = 'block'; 
		}; 
	}; 
};

	<div class="up-scroll up-scroll_unviev"> 
		<i class="icon-arrow-up"></i> 
	</div>