Do you know that Search Engine actually sees things differently from people do, especially the contents in your website? Contents that can be read or viewed by people or users may be invisible to Search Engine. If you want your website or web pages to be ranked with your desired keywords, you have to let Search Engine see your contents to determine what your website is about. Therefore today I would like to tell something that can make your contents invisible.

- Flash : Currently, more websites are totally built by Flash since Flash can make your website more enticing and interactive with users quite well. I can see a lot of these websites in interior design business. Although, Flash can make your website very cool in users’ sights, it is not search engine friendly since Search Engine cannot see the contents in such these websites. I heard someone said that now Google can read the contents in Flash but it is not 100% confirmed. Indeed, you can have some Flash elements in your websites but what you should not do is making your website entirely Flash.

- IFrame : IFrame is normally implemented for displaying the same content in multiple HTML pages or making web pages fit with the required size. Although, using Iframe can make your website easier to maintain since for example if you want to edit the special promotion displayed in every web page, you just edit it in one place instead of editing it in every web page, Iframe can also make your contents invisible to Search Engine. You may consider using something else like include file instead.

- JavaScript : JavaScript can be used to displayed various contents. For instance, I have seen some webmasters use JavaScript to display News fed from other sources in their websites so News will be automatically updated according to the original sources. However, these news are not viewable by Search Engine since they are displayed by using JavaScript so in this case webmasters may consider using RSSParser to display the fed News.

- Images : Some webmasters publish contents in their websites as images and I am not sure why they did that. This is probably because they already have some paper based materials like fact sheets, brochures, leaflets that contain the information about their organizations so they may just scan these papers and put them in their websites. With this, the contents can be read by users but Search Engines. Some of them may say they can put the contents displayed as images in Alt Tag since Search Engine can read contents in this Tag. However, Alt Tag is supposed to use to describe the image not the website. Moreover, you should not put too many words in Alt Tag.

If you want to know how Search Engine see your websites, you can find many tools by searching in Google with keyword ‘Spider Simulator’.