I tried to validate my website and I get the following error :
there is no attribute "class"
<aside class="left-off-canvas-menu">element "aside" undefined
<aside class="left-off-canvas-menu">there is no attribute "property"
<meta property="og:title" content="Growth Scorecard" />document type does not allow element "div" here
…+' preptimeline timeline-portion" title="'+titles[parseInt(val)-1]+'"></div>');
How can I solve this error please suggest to me. I have less knowledge of XHTML. please let me know. why an error occurs on my website.
You can see validator's error report.
The elements and attributes you are using were introduced in HTML 5.
XHTML 1.0 Transitional is too old to support them.
Use HTML 5 instead. It better reflects what browsers actually support and what you are trying to do.