Found the following HTML validation problems:
github_document.html:152:100: Warning: inserting implicit <p>
github_document.html:152:100: Warning: trimming empty <p>
html_document.html:244:45: Warning: inserting implicit <p>
html_document.html:399:100: Warning: inserting implicit <p>
html_document.html:423:83: Warning: inserting implicit <p>
html_document.html:434:63: Warning: inserting implicit <p>
html_document.html:442:136: Warning: inserting implicit <p>
html_document.html:244:45: Warning: trimming empty <p>
html_document.html:399:100: Warning: trimming empty <p>
html_document.html:423:83: Warning: trimming empty <p>
html_document.html:434:63: Warning: trimming empty <p>
html_document.html:442:136: Warning: trimming empty <p>
html_document_base.html:119:45: Warning: inserting implicit <p>
html_document_base.html:119:45: Warning: trimming empty <p>
html_notebook.html:192:45: Warning: inserting implicit <p>
html_notebook.html:192:45: Warning: trimming empty <p>
ioslides_presentation.html:181:45: Warning: inserting implicit <p>
ioslides_presentation.html:282:156: Warning: inserting implicit <p>
ioslides_presentation.html:319:66: Warning: inserting implicit <p>
ioslides_presentation.html:356:41: Warning: inserting implicit <p>
ioslides_presentation.html:374:75: Warning: inserting implicit <p>
ioslides_presentation.html:383:99: Warning: inserting implicit <p>
ioslides_presentation.html:391:91: Warning: inserting implicit <p>
ioslides_presentation.html:407:89: Warning: inserting implicit <p>
ioslides_presentation.html:411:46: Warning: inserting implicit <p>
ioslides_presentation.html:419:101: Warning: inserting implicit <p>
ioslides_presentation.html:444:103: Warning: inserting implicit <p>
ioslides_presentation.html:448:76: Warning: inserting implicit <p>
ioslides_presentation.html:474:42: Warning: inserting implicit <p>
ioslides_presentation.html:181:45: Warning: trimming empty <p>
ioslides_presentation.html:282:156: Warning: trimming empty <p>
ioslides_presentation.html:319:66: Warning: trimming empty <p>
ioslides_presentation.html:356:41: Warning: trimming empty <p>
ioslides_presentation.html:374:75: Warning: trimming empty <p>
ioslides_presentation.html:383:99: Warning: trimming empty <p>
ioslides_presentation.html:391:91: Warning: trimming empty <p>
ioslides_presentation.html:407:89: Warning: trimming empty <p>
ioslides_presentation.html:411:46: Warning: trimming empty <p>
ioslides_presentation.html:419:101: Warning: trimming empty <p>
ioslides_presentation.html:444:103: Warning: trimming empty <p>
ioslides_presentation.html:448:76: Warning: trimming empty <p>
ioslides_presentation.html:474:42: Warning: trimming empty <p>
slidy_presentation.html:186:45: Warning: inserting implicit <p>
slidy_presentation.html:186:45: Warning: trimming empty <p>