Reading a Master Page at Design Time

Master pages contain a lot of content and are therefore difficult to read and understand when opened for design in SharePoint Designer. Like standard HTML or ASPX pages, master pages contain HTML markup that controls how their content is rendered (for example, a master page contains a body, and within that body a form, and within that form a table, and so on). However, a master page also contains all of the ASP.NET content region controls necessary to allow other pages to be derived from it and create custom content themselves. A master page might also contain a series of ASP.NET controls, SharePoint controls, Web Parts, and links to CSS (.css) or Javascript (.js) files. The most important SharePoint elements ...

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