Tenés que corregir especificamente los siguientes errores
Result: 17 errors / 0 warnings
line 56 column 8 - Error: an attribute value specification must be an attribute value literal unless SHORTTAG YES is specified
line 57 column 10 - Error: there is no attribute "href"
line 57 column 22 - Error: element "A" undefined
line 58 column 29 - Error: element "A" undefined
line 59 column 28 - Error: element "A" undefined
line 60 column 28 - Error: element "A" undefined
line 61 column 25 - Error: element "A" undefined
line 62 column 29 - Error: element "A" undefined
line 65 column 73 - Error: value of attribute "align" cannot be "Left"; must be one of "top", "middle", "bottom", "left", "right"
line 72 column 6 - Error: end tag for element "h2" which is not open
line 79 column 6 - Error: end tag for element "h2" which is not open
line 87 column 207 - Error: required attribute "alt" not specified
line 95 column 11 - Error: end tag for element "div" which is not open
line 96 column 6 - Error: end tag for element "BODY" which is not open
line 96 column 13 - Error: end tag for element "HTML" which is not open
line 96 column 15 - Error: end tag for "body" omitted, but OMITTAG NO was specified
line 51 - Info: start tag was here
line 96 column 15 - Error: end tag for "html" omitted, but OMITTAG NO was specified
line 2 - Info: start tag was here
Si bien no todos son tan graves, los que refieren a cierre y apertura de tags si lo son
Estos por ejemplo
<div id="textos2">
</h2><h3 class="h3">Arquitecto técnico para trabajos en la provincia de Valencia, Alicante y Castellón.
</h3></div>
<div id="textos">
<h1 class="h1">Vicent Oller Vives · Arquitecto técnico</h1> </div>
<div id="textos3">
</h2><h3 class="h3"> Aparejador en Valencia.
</h3></div>
Saludos