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c6d4066201
When a site has policies but a user has not logged in, a banner is displayed to inform the guest user of the polciies. This banner was inserted by Javascript at the end of the DOM, so keyboard users had to tab through the whole page to reach it. This commit makes the following changes: * Change the callback used to display the policy banner from _before_standard_html_head to _before_standard_top_of_body_html. * Define the banner's body text in an HTML element, rather than a Javascript parameter. * Set absolute positioning on the banner for behat sites, so it does not display at the top of the page and overlap the site header. * Revert use of the standard_head_html_prepend hook in tool_policy from MDL-79076. The combination of these changes means that the banner will be output near the start of the HTML DOM, so will be accessible to keyboard users early on in the tab order until dismissed. However, it will still appear visually at the end of the page, to avoid clashing with the site header.