how to add a custom meta dynamic tag in all page using a module in magento 2

Question

i want to make a module which will add a custom meta tag which will be dynamic as per page .it will appear in all page.

i want this to be appear after meta name "viewreport".

Answer 1

I am not sure about add meta after meta name "viewreport", But you can add dynamic like adding below code into default.xml

<referenceContainer name="after.body.start">
    <block class="Magento\Framework\View\Element\Template" name="test" template="test.phtml" after="-"/>            
</referenceContainer>

OR

<referenceContainer name="before.body.end">
    <block class="Magento\Framework\View\Element\Template" name="test" template="test.phtml" after="-"/>
</referenceContainer>

OR

<referenceBlock name="head.additional">
    <block class="Magento\Framework\View\Element\Template" name="test" template="test.phtml" after="-"/>
</referenceBlock> 

Thanks