javascript - Why object's name modified when there is a master page in asp.net projects? -

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i creating asp.net project have 1 master page pages. why object's name example div id="div1" changed ctl00_ div1 when object in master page?

it ensure uniqueness of id.

the master page can include content multiple sources, prepends each id ensure unique across sources. value prepended represents content section content within.


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