In Sciter <frame> element may have content-style attribute defined.
That content-style attribute takes URL of style sheet that gets applied on top of existing styles of the document:
<frame src="some-child.htm" content-style="content.css" />
That content.css gets appended to the list of other styles of the some-child.htm as if that document has <link rel="stylesheet" type="text/css" href="content.css"> at the end:
<html>
<head>
<style>
... local styles ...
</style>
</head>
<body>
... local content ...
</body>
<link rel="stylesheet" type="text/css" href="content.css">
</html>
So when host document wants:
- to customize rendering of child document in the frame
- and/or inject some scripting behaviors in it
it can provide its own content.css file without the need of that child element modification.
Sciter SDK built-in document browser is an example of content-style usage:
{sciter-sdk]/doc/main.htm defines content frame as:
<frame #content src="content/preface.htm" content-style="styles/content.css"/>
so each document loaded into the frame gets {sciter-sdk}/doc/styles/content.css applied to its content