I came across this while looking on asos.com I did some googling to try and find out what it is but there appears to be no information anywhere. I was just wondering if anybody had a better idea why they use it?
This is how it appears in their code:
<div class="title">
<h1><span id="ctl00_ContentMainPage_ctlSeparateProduct_lblProductTitle"
class="product_title"><!--mp_trans_seo_url_title_start-->ASOS Canvas Backpacks
with Contrast Pockets<!--mp_trans_seo_url_title_end--></span></h1>
<span><meta itemprop="name" content='ASOS Canvas Backpacks with Contrast
Pockets | ASOS'/></span>
It’s simply a HTML comment; possibly generated by a server side language like PHP (or other) indicating where the result of a variable (for the page title in this case) is placed.
The variable is possibly called “mp_trans_seo_url_title” in their system of choice and the HTML comments there, indicate where it ‘begins’ and ‘ends’ its output.
That is all. Nothing suspicious or out of the ordinary here.