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Tag: Mobile

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Your users aren’t on flagship phones. Testing, tooling, and hard numbers for the low- and mid-tier devices most of the web runs on.


2026


  1. Low- and Mid-Tier Mobile for the Real World (2026)

  2. Meet Your Users Where They Are with Obs.js

2025


  1. Obs.js: Context-Aware Web Performance for Everyone

  2. Low- and Mid-Tier Mobile for the Real World (2025)

2021


  1. Measuring Web Performance in Mobile Safari

2013


  1. Responsive grid systems; a solution?

2012


  1. Announcing pr.ofile.me

2011


  1. Build-along #1, reflection and reasoning

  2. Sam Penrose Design — process and write-up

  3. Fully fluid, responsive CSS carousel

  4. Borders on responsive images

  5. Responsive images right now

  6. Fluid grid calculator

  7. Mobile business card

  8. Scrolling overflowed content in iOS

2010


  1. Media queries, handier than you think

  2. Mark up a semantic, accessible, progressively enhanced, mobile optimised progress bar (bonus: style the numbers in an ordered list!)

  3. I hate that I love Writer

  4. A quick counter to 'The Digital Agencies of the Future!'

  5. 30 days without an iPhone

  6. Moving forward is holding us back

  7. iPhone CSS — tips for building iPhone websites

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Hi there, I’m Harry Roberts. I am an award-winning Consultant Web Performance Engineer, designer, developer, writer, and speaker from the UK. I write, Tweet, speak, and share code about measuring and improving site-speed. You should hire me.


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I help teams achieve class-leading web performance, providing consultancy, guidance, and hands-on expertise.

I specialise in tackling complex, large-scale projects where speed, scalability, and reliability are critical to success.