Adopting nodes ignores styling

Subject: Adopting nodes ignores styling

From: Mike Abdullah <email@hidden>

Date: Fri, 05 Aug 2011 12:43:53 +0100

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We have a system where:

1. A chunk of HTML is loaded into an offscreen webview

2. Once the webview has loaded, the DOM nodes making up the content are brought across to the onscreen webview

3. The nodes are used to replace existing nodes in the onscreen DOM

Originally, we were using -[DOMDocument importNode:deep] to copy across the nodes. Then, at some point I discovered -adoptNode: which better matches what we want. It has two advantages for us:

- More memory efficient, since the nodes are moved rather than copied

- Doesn't throw an exception if the HTML fed into the offscreen produced a non-standard DOM tree. e.g. a user entered custom HTML which places content inside an element which is supposed to be empty

But I've realised there's quite a big bug. After inserting the nodes into the main document, most CSS rules that match don't take effect. For example, if the offscreen HTML is a Contact Form, it's supposed to have this CSS applied to a field:

ContactElement.css:

textarea.fullWidth, input.fullWidth, select.fullWidth {

• width: 96%;

• margin: 4px 0;

}

Loading the HTML directly in the onscreen webview, correctly matches that rule. However, bringing in the exact same HTML from the offscreen webview only matches rules from main.css and user agent.

Is this the intended behaviour of -adoptNode: or a bug?

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