[SalesForce] Embedded HTML in visualforce page

I managed to hack my way around it by using JavaScript in the command button oncomplete to do the redirection from the top level window.

Simplified Page:

My reality is a bit more complicated as the Command button is a dynamic Visualforce component.

E.g. public PageReference stubAction() { return null; }

public PageReference editDynamicProperties() {
    PageReference editpr = Page.AnotherPage;

    Map<string, string> params = editpr.getParameters();
    params.put('oppId', opportunityFromController.Id);

    editpr.setRedirect(true);
    return editpr;
}

public Component.Apex.OutputPanel getDynamicPropertyControls() {
    //...

    Component.Apex.PageBlockButtons pbButtons = new Component.Apex.PageBlockButtons();
    pb.childComponents.add(pbButtons);

    Component.Apex.CommandButton editCommandButton = new Component.Apex.CommandButton();
    editCommandButton.value='Edit';
    //editCommandButton.expressions.action = '{!editDynamicProperties}';
    editCommandButton.expressions.action = '{!stubAction}';

    editCommandButton.rerender= new Set<string>{'dynamicForm'};
    editCommandButton.oncomplete= 'window.top.location.href = \''+editDynamicProperties().getUrl()+'\'';
    pbButtons.childComponents.add(editCommandButton);

    //...
}

UPDATE: Apparently I've come across this problem before. See Visualforce Page embedded in a detail page that needs to redirect to other page That question had a very similar answer by JCD, but the redirection was handled by the rerendered component.

This is something which cannot be achieved by purely using custom labels. Any line breaks in the custom label is lost and the text is displayed as a single line on VF page.

This is what I do.

Split the string with any random character.

If the custom label is 'This is Line One. This is Line Two', I will change it to 'This is Line One. 555 This is Line Two'.

Replace '555' with any random character that you find it easy to remember.

String s = Label.YourLabelName;
List<String> l = s.split('555');

l[0] will contain the first sentence and l[1] will contain the second sentence. Use this list on VF page.