How to change title in browser window?

Question

1C-Bitrix

in the news.detail template I write

<?if(!defined("B_PROLOG_INCLUDED") || B_PROLOG_INCLUDED!==true)die();?>
<?
$APPLICATION->SetPageProperty("title", "hi");

the old header is still displayed, what's the matter?

Answer 1

A popular mistake is that deferred functions are called in the component template: $APPLICATION->SetTitle(), $APPLICATION->AddChainItem(), etc. In this case, they only work when caching is disabled.
You need to do this
in result_modifier.php

$arResult["CUSTOM_TITLE"] = $arResult["NAME"]; //Тут формируйте свой заголовок

$cp = $this->__component; 
if (is_object($cp)) {
    $cp->SetResultCacheKeys(array(
        "CUSTOM_TITLE",
    ));
}

in component_epilog.php
In order not to make such mistakes, read about the component caching mechanism.