- From: Tom Croucher <tcroucher@netalleynetworks.com>
- Date: Wed, 3 Dec 2003 11:35:49 +0000
- To: Jens Meiert <jens.meiert@erde3.com>
- Cc: w3c-wai-gl@w3.org
- Message-Id: <D7F58AF6-2584-11D8-862F-003065C9C000@netalleynetworks.com>
>>> Question: Do search engines really scan alt text given for images ? ><snip /> >> one of my co-workers was architect at alta-vista so I asked him; seems >> that 'most' search engines should be expected to parse text that is in >> elements and can be expected to parse certain attribute values, like >> alt, as well. >I also remember cases (when searching via Google) where 'alt' attribute >values were shown, but unfortunately I was neither able to reproduce this nor >have I found documentation about this right now. Search engines and indexing is something I spent some time studying and as far as I am aware search engines do not use alt text in indexing in practice any longer. There are a few points related to this, the main reason why not to use it in indexing is to avoid 'non-visual stuffing', which is a practice where a page is filled with keywords in an attempt to aim a high ranking score on search engines. In order to not put users off this text was often hidden in the alt text of images or in text of the same colour as the background. To avoid genuine results being offset by these techniques engines such as google largely ignore alt text, and even metadata in the <meta> tags. The other issue is that alt text is semantically dead. So while a 'real' text alternative as provided by the object tag can contain markup with <em>, <hX> and so on alt attribute text at the most can be one of these types if the images tag is wrapped by it. (i.e. <h1><img src="logo.jpg" alt="My company" /></h1>). I might add that most of the internal workings of each search engine are confidential and this is to some extent speculation. Tom
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Received on Wednesday, 3 December 2003 06:35:58 UTC