Duplicate IDs

Each ID on your web page must be unique in order for your site to function properly and this is moreso important when using systems that extensively utilise ID tags, such as SimpleCMS.

As SimpleCMS references those IDs to the content the ID relates to, so when you edit your site the system can make the correct areas editable through knowing the unique ID of each area on the web page.

If you have duplicate IDs on your web page then the system will not know which area is the correct area to make editable.

The system will automatically check if the ID of an area is duplicated on the same web page and prevent you from making this an editable area.

Duplicating IDs on your webpage will also make your site invalid. W3C offer a validation tool which checks your site is valid and provides you with a detailed list of warnings and errors, if any occur. You can find the validation tool here:
http://smplc.ms/w3validator

The correct use of ID attributes can also be found on the W3 Schools website:
http://smplc.ms/w3idattribute

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Short URL http://smplc.ms/duplicateids