conditional comment Conditional comments are conditional statements interpreted by Microsoft Internet Explorer versions 5 through 9 in HTML source code. Conditional comments can be used to provide and hide code to and from Internet Explorer. Conditional comments are no longer supported in IE10 and IE11. Conditional comments in HTML〔(【引用サイトリンク】 title=About Conditional Comments )〕 first appeared in Microsoft's Internet Explorer 5 browser, although support has now been deprecated. In Internet Explorer 10 HTML conditional comments are not supported when the page is in standards mode (document mode 10).〔(Microsoft - HTML5 Parsing in IE10 )〕 JScript conditional comments were introduced in Internet Explorer 4 and they continue to be supported in Internet Explorer 10, in standards mode or compatibility mode. ==Examples== Here is a simple example that demonstrates how conditional comments work.