Found the following HTML validation problems:
faq-compatibility-types.html:47:42: Warning: inserting implicit <p>
faq-compatibility-types.html:57:38: Warning: inserting implicit <p>
faq-compatibility-types.html:90:98: Warning: inserting implicit <p>
faq-compatibility-types.html:47:42: Warning: trimming empty <p>
faq-compatibility-types.html:57:38: Warning: trimming empty <p>
faq-compatibility-types.html:90:98: Warning: trimming empty <p>
faq-error-scalar-type.html:25:69: Warning: inserting implicit <p>
faq-error-scalar-type.html:49:79: Warning: inserting implicit <p>
faq-error-scalar-type.html:76:89: Warning: inserting implicit <p>
faq-error-scalar-type.html:25:69: Warning: trimming empty <p>
faq-error-scalar-type.html:49:79: Warning: trimming empty <p>
faq-error-scalar-type.html:76:89: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:63:52: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:118:32: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:126:65: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:137:46: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:154:53: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:171:34: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:184:65: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:214:93: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:238:49: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:280:85: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:298:35: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:335:35: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:345:83: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:369:39: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:380:75: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:390:88: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:404:83: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:415:63: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:434:64: Warning: inserting implicit <p>
howto-faq-coercion-data-frame.html:63:52: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:118:32: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:126:65: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:137:46: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:154:53: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:171:34: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:184:65: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:214:93: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:238:49: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:280:85: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:298:35: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:335:35: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:345:83: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:369:39: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:380:75: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:390:88: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:404:83: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:415:63: Warning: trimming empty <p>
howto-faq-coercion-data-frame.html:434:64: Warning: trimming empty <p>
howto-faq-coercion.html:49:34: Warning: inserting implicit <p>
howto-faq-coercion.html:87:52: Warning: inserting implicit <p>
howto-faq-coercion.html:111:50: Warning: inserting implicit <p>
howto-faq-coercion.html:135:58: Warning: inserting implicit <p>
howto-faq-coercion.html:145:53: Warning: inserting implicit <p>
howto-faq-coercion.html:159:102: Warning: inserting implicit <p>
howto-faq-coercion.html:169:90: Warning: inserting implicit <p>
howto-faq-coercion.html:180:50: Warning: inserting implicit <p>
howto-faq-coercion.html:203:38: Warning: inserting implicit <p>
howto-faq-coercion.html:236:33: Warning: inserting implicit <p>
howto-faq-coercion.html:244:43: Warning: inserting implicit <p>
howto-faq-coercion.html:261:34: Warning: inserting implicit <p>
howto-faq-coercion.html:268:33: Warning: inserting implicit <p>
howto-faq-coercion.html:277:45: Warning: inserting implicit <p>
howto-faq-coercion.html:295:71: Warning: inserting implicit <p>
howto-faq-coercion.html:49:34: Warning: trimming empty <p>
howto-faq-coercion.html:87:52: Warning: trimming empty <p>
howto-faq-coercion.html:111:50: Warning: trimming empty <p>
howto-faq-coercion.html:135:58: Warning: trimming empty <p>
howto-faq-coercion.html:145:53: Warning: trimming empty <p>
howto-faq-coercion.html:159:102: Warning: trimming empty <p>
howto-faq-coercion.html:169:90: Warning: trimming empty <p>
howto-faq-coercion.html:180:50: Warning: trimming empty <p>
howto-faq-coercion.html:203:38: Warning: trimming empty <p>
howto-faq-coercion.html:236:33: Warning: trimming empty <p>
howto-faq-coercion.html:244:43: Warning: trimming empty <p>
howto-faq-coercion.html:261:34: Warning: trimming empty <p>
howto-faq-coercion.html:268:33: Warning: trimming empty <p>
howto-faq-coercion.html:277:45: Warning: trimming empty <p>
howto-faq-coercion.html:295:71: Warning: trimming empty <p>
howto-faq-fix-scalar-type-error.html:31:93: Warning: inserting implicit <p>
howto-faq-fix-scalar-type-error.html:38:38: Warning: inserting implicit <p>
howto-faq-fix-scalar-type-error.html:44:79: Warning: inserting implicit <p>
howto-faq-fix-scalar-type-error.html:52:110: Warning: inserting implicit <p>
howto-faq-fix-scalar-type-error.html:73:71: Warning: inserting implicit <p>
howto-faq-fix-scalar-type-error.html:81:98: Warning: inserting implicit <p>
howto-faq-fix-scalar-type-error.html:90:52: Warning: inserting implicit <p>
howto-faq-fix-scalar-type-error.html:31:93: Warning: trimming empty <p>
howto-faq-fix-scalar-type-error.html:38:38: Warning: trimming empty <p>
howto-faq-fix-scalar-type-error.html:44:79: Warning: trimming empty <p>
howto-faq-fix-scalar-type-error.html:52:110: Warning: trimming empty <p>
howto-faq-fix-scalar-type-error.html:73:71: Warning: trimming empty <p>
howto-faq-fix-scalar-type-error.html:81:98: Warning: trimming empty <p>
howto-faq-fix-scalar-type-error.html:90:52: Warning: trimming empty <p>
internal-faq-matches-algorithm.html:23:368: Warning: inserting implicit <p>
internal-faq-matches-algorithm.html:57:129: Warning: inserting implicit <p>
internal-faq-matches-algorithm.html:171:281: Warning: inserting implicit <p>
internal-faq-matches-algorithm.html:196:368: Warning: inserting implicit <p>
internal-faq-matches-algorithm.html:255:584: Warning: inserting implicit <p>
internal-faq-matches-algorithm.html:264:237: Warning: inserting implicit <p>
internal-faq-matches-algorithm.html:280:202: Warning: inserting implicit <p>
internal-faq-matches-algorithm.html:23:368: Warning: trimming empty <p>
internal-faq-matches-algorithm.html:57:129: Warning: trimming empty <p>
internal-faq-matches-algorithm.html:171:281: Warning: trimming empty <p>
internal-faq-matches-algorithm.html:196:368: Warning: trimming empty <p>
internal-faq-matches-algorithm.html:255:584: Warning: trimming empty <p>
internal-faq-matches-algorithm.html:264:237: Warning: trimming empty <p>
internal-faq-matches-algorithm.html:280:202: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:50:102: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:56:123: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:61:49: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:81:82: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:94:45: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:108:33: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:119:48: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:124:78: Warning: inserting implicit <p>
internal-faq-ptype2-identity.html:50:102: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:56:123: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:61:49: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:81:82: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:94:45: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:108:33: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:119:48: Warning: trimming empty <p>
internal-faq-ptype2-identity.html:124:78: Warning: trimming empty <p>
theory-faq-coercion.html:49:92: Warning: inserting implicit <p>
theory-faq-coercion.html:134:67: Warning: inserting implicit <p>
theory-faq-coercion.html:162:37: Warning: inserting implicit <p>
theory-faq-coercion.html:184:58: Warning: inserting implicit <p>
theory-faq-coercion.html:326:45: Warning: inserting implicit <p>
theory-faq-coercion.html:335:80: Warning: inserting implicit <p>
theory-faq-coercion.html:49:92: Warning: trimming empty <p>
theory-faq-coercion.html:134:67: Warning: trimming empty <p>
theory-faq-coercion.html:162:37: Warning: trimming empty <p>
theory-faq-coercion.html:184:58: Warning: trimming empty <p>
theory-faq-coercion.html:326:45: Warning: trimming empty <p>
theory-faq-coercion.html:335:80: Warning: trimming empty <p>
vctrs-package.html:23:4: Warning: <img> attribute "align" not allowed for HTML5