Width attribute on table col elements causes validation errors #1062
Description
When post_content contains HTML such as:
<table class="auto-style1 sws_custom_table" style="width: 100%; display: table; background-color: #ffffff; border: 2px solid #eaeaea;" border="0" width="630" cellspacing="0"><colgroup> <col style="mso-width-source: userset; mso-width-alt: 8988; width: 190pt;" width="253" /> <col style="mso-width-source: userset; mso-width-alt: 6826; width: 144pt;" width="192" /> <col style="mso-width-source: userset; mso-width-alt: 8135; width: 172pt;" width="229" /></colgroup>
...</table>This is getting converted to AMP as:
<table class="auto-style1 sws_custom_table amp-wp-inline-976a106f7543a9a2e8e3c8a97560be03" width="630"><colgroup><col width="253" class="amp-wp-inline-16106abec734b745f40158cc486aa0fe"/><col width="192" class="amp-wp-inline-91e2d2d529220418b62e99acb85f0928"/><col width="229" class="amp-wp-inline-43ca072c586bb2eaad4c6de773864f95"/></colgroup>
...</table>This results in a validation error:
DISALLOWED_HTML: The attribute 'width' may not appear in tag 'col'.
First of all, maybe it is a bug in AMP that this attribute is not allowed. We should double check that first.
Otherwise, if it is really not allowed, then whitelist sanitizer may be incorrectly merging the width layout attribute among the attributes allowed on an element:
See here:
layout_allowed_attributes is not globally-allowed it seems. Maybe that condition needs to be removed.
As reported on https://wordpress.org/support/topic/not-a-valid-amp-page-7/