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We recommend that you use standards-compliant XHTML on pages that contain maps. When browsers see the XHTML DOCTYPE at the top of the page, they render the page in "standards compliance mode," which makes layout and behaviors much more predictable across browsers.
If you want to show polylines on your map (like the lines used by Google Maps to show driving directions), you need to include the VML namespace and some CSS code in your XHTML document to make everything work properly in IE.
