add docs

site/content/docs/04-compile-time.md

@@ -306,6 +306,30 @@ const { code } = svelte.preprocess(source, [
 });
 ```
 
+---
+
+User may override default preprocessor order by passing `strictOrder` option.
+
+```js
+const svelte = require('svelte/compiler');
+
+const { code } = svelte.preprocess(source, [
+	{
+		style: () => {
+			console.log('this runs first');
+		}
+	},
+	{
+		markup: () => {
+			console.log('this runs second');
+		}
+	}
+], {
+	filename: 'App.svelte',
+	strictOrder: true
+});
+```
+
 
 ### `svelte.walk`