Media chapter Markdown

[eeeps]

NOT yet ready to merge.

TODO before this is ready to merge:

• Incorporate any final final edits from @MichaelLewittes
• Proper figure embeds
• Markdown check
• Chart alt text
• Final chart styles
• Fallback chart images
• Front matter metadata
• Remaining TODOs
• Final readthrough
• Make linter happy
• Add DOI from @nrllh
• Update dates in last_updated.json

[eeeps]

Here are links to all of the charts (checked-off ones already have correct styles):

• Count of <img> elements per page.
• Distribution of image pixel counts.
• Largest image per page (by pixel count).
• Image orientations.
• Image format adoption (mobile).
• Image format adoption, 2-year change (mobile).
• Distribution of image byte sizes.
• Largest image per page (by kilobytes).
• Distribution of image bits per pixel.
• Median bits per pixel by format.
• GIF bits per pixel: animated vs. non-animated.
• Distribution of animated GIF frame counts.
• Adoption of <img loading=lazy>.
• srcset descriptor usage.
• Distribution of <img sizes> errors.
• Excess kilobytes loaded per page due to inaccurate sizes.
• <picture> feature usage.
• Distribution of <img> layout widths.
• Widest <img> per page (layout width).
• Intrinsic and extrinsic image sizing (mobile).
• Image hosts: same vs cross domain.
• Video durations.
• Top extensions of files with a video MIME type.
• Video attribute usage.
• Number of <source>s per <video>.