WordPress stripping out HTML

In WordPress I'm wanting to create links to jump down the page. So at the top I have something like:-

<a href="#a-blessing-for-a-poet">A Blessing For A Poet</a>
<a href="#the-bore">The Bore</a>
<a href="#rock-and-roll">Rock And Roll</a>

Then further down I have lines like:-

<a id="rock-and-roll">&nbsp;</a>

<a href="http://charliem.poetrybooks.org/rock-and-roll/">Rock And Roll</a>

[audio mp3="http://www.yarnwhispering.co.uk/wp-content/uploads/2018/03/Rock-And-Roll.mp3" ogg="http://www.yarnwhispering.co.uk/wp-content/uploads/2018/03/Rock-And-Roll.ogg"][/audio]

Why is this happening?

The problems is that this saves fine but if I save and switch to the "Visual" tag and view the draft it's fine. However if I go back and swith back to "Text" view WP has stipped out the link and I just have:-


<a href="http://charliem.poetrybooks.org/rock-and-roll/">Rock And Roll</a>
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Martin MillerCTOCommented:
Yes, Wordpress does strip out format tags, etc, that don’t conform to their theme-model. You can extend customization outside of the theme-model, but, you may have issues with future updates.

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cescentmanAuthor Commented:
Can I get round this by using a child theme? If so where do I look for a solution?
Martin MillerCTOCommented:
You can get around this but, you need to modify a bit of PHP code, and also accept you're not going to be able to update easily. PHP code in both the Theme and the Core will need to be modified.
cescentmanAuthor Commented:
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