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In legacy code, I encountered an unknown attribute spsourceindex, what is it used for? Example

<nav class="size-options">
    <a href="#" class="any-class" spsourceindex="25">One</a>
    <a href="#" class="any-class" spsourceindex="30">Two</a>
    <a href="#" class="any-class" spsourceindex="31">Three</a>
    <a href="#" class="any-class" spsourceindex="32">Four</a>
</nav>

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