CSS tables should be linked within the <head> tag of a header (header.php) in the following way 

<?
$APPLICATION->ShowCSS(); 
?>

All the required HTML code will be inserted by the API function specified above. This function includes a CSS file from the current template. Also it includes all additional styles defined for the page by calling the function SetAdditionalCSS() internally. 

<?	
$APPLICATION->SetAdditionalCSS("/bitrix/templates/demo/additional.css");
?>

If called without arguments, the ShowCSS() method includes styles by adding the following code: 

<LINK href="/bitrix/templates/demo/styles.css" type="text/css" rel="STYLESHEET">

All styles added by calling SetAdditionalCSS() will be included in the page code as follows: require(…).

If called with the false argument, 

<?
$APPLICATION->ShowCSS(false);
?>

then the CSS file of the current template is also included by calling require().



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