This seems to be a recurring issue, but none of the solutions I've found have worked for me.
I'm using a file, dashboardStyles.php, to generate my css.
I link to the file by
<link href="../styles/dashboardStyle.php" rel="stylesheet" type="text/css" />
The dashboardStyle.php file begins with
<?php
header('Content-type: text/css', true);
...
However, the browser gives a warning: Resource interpreted as Stylesheet but transferred with MIME type text/html
And the file type shows as html in chrome's network tab, and the CSS is not applied.
If I edit the file at all in the browser, all the CSS is applied. Also, strangely, if I execute any javascript before my html tags, it is also applied.
How can I get the content type header to be delivered & respected?